Quantity . Clean the caliper before use. Title of Legally Binding Document: Vernier Calipers, Part I: Vernier Calipers with Least Count 0.1 mm and 0.05 mm Number of Amendments: 2 Equivalence: Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New--Jawaharlal Nehru ... PDF download. 0000005337 00000 n
download 1 file . Here is a nice vernier calipers applet. v Press ON/ZERO button, 0.00 mm displ Combined … 0000010668 00000 n
0000002356 00000 n
Construction: A Vernier caliper consist of a rectangular steel bar whose one side is graduated in centimeters. Apart from that, a detailed article on Working of Vernier Caliper was also discussed. 0000001238 00000 n
THEORY: It uses two scale one fixed and other movable. 0000003915 00000 n
Setting the origin : calibration of vernier caliper. xref
0000004380 00000 n
download 1 file . The main cause of calipers becoming uncalibrated are chips getting in the rack and causing the pinion to skip teeth on the rack. Vernier, dial, and digital calipers can be used with accessories that extend their usefulness. The Production, Inspection and Calibration Service Departments of Mitutoyo Corporation also ... 10 Caliper Up to 600mm More than 600mm up to 1000mm 0.02mm 0.03mm 11 Height Gage Up to 600mm More than 600mm up to 1000mm 0.015mm 0.020mm 12 Depth Gage Up to 600mm More … This vernier caliper PDF file is a very suitable first step for someone looking to buy a vernier caliper whether it is for first time users or even for industrial procurement departments. IS 3651-2: Vernier Calipers, Part 2: Vernier Calipers with Least Count 0.02 mm Item Preview > ... PDF download. 0000003364 00000 n
Clean the Vernier Caliper’s measuring surfaces, the granite surface, and the gauge blocks to be used . Using Calipers Proper calibration can not help in Calibration frequency is annually. Calibration of Vernier Calliper . v Upon installation of the batteries, the “….” Indicator will blink in the display. Vernier Calipers OBJECT: To determine the radius of a cylinder using Vernier calipers Apparatus used: Cylinder, Vernier calipers. DRM Enabled PDF. The most internationally widely used caliper standard (DIN 0000002069 00000 n
Vernier caliper can be used for three types of measurements, outside distance (such as the length of an object),2nd one is inside distance such as the width of a groove or the diameter of a large hole, 3rd one is depth, such as the depth of a hole or the height of a step. (30µm = 0.00118 ins.) No: NABL 129 Specific Criteria for Accreditation of Calibration Laboratories (Mechanical, Fluid flow, Radiological, Electro-Technical & Thermal Calibration) 3.Check the indicated value, if reading is zero, then the zero-point setting is complete. This highly sensitive nature also makes it necessary for the … Read the actual reading of the object directly on the LCD of Vernier Calliper. 0000002521 00000 n
This standard covers vernier calipers with external and internal contact faces from 0 - 48"/0 -1000mm. TEXT download. the beam, the fixed jaw and the sliding jaw permit substantial improvements over direct measurement with graduated rules. 47 0 obj
<<
/Linearized 1
/O 50
/H [ 1385 377 ]
/L 168292
/E 69588
/N 7
/T 167234
>>
endobj
xref
47 39
0000000016 00000 n
Vernier Calipers:Part1 - Vernier Calipers with least count 0.1 mm and 0.05 mm: IS : 3651 (Pt2) - 1985 : Vernier Calipers with least count 0.02 mm: IS : 4213 - 1991 : Vernier Depth Gauges ( upto 300 mm ) IS : 9112 - 1979 : Screw Thread Micrometers ( Withdrawn) IS : 2921 - 1988 : Vernier Height Gauge ~ 0.00004 ins. Calipers without a scale originated in ancient China as early as the Qin dynasty (AD 9). Internation Scientific Indexing ISI. 0000001544 00000 n
A Guide To Ammunition Collecting International. 5.3.6 Measure the thickness of standard slip gauge (0.05 mm to 1.00 mm) by putting individual gauge between the jaw. This can be seen if the dial is not returning to zero when closed… TORRENT download. 0000003164 00000 n
Caliper Calibration: Calipers can need calibrated to maintained accuracy. Among 5.3.3 For vernier caliper press on key with the jaw closed. The following information covers digital calipers but can also be used for dial or even Vernier calipers, if those are still in use. (30µm = 0.00118 ins.) 3. Micrometer Linear anvil measurement 5.3.5 Open the jaw. ISO 13385-1 provides for the international definition of the design and metrological characteristics of calipers important in the specification, manufacture, and purchase of calipers; however, ISO 13385-1 does not provide specification values, detailed test methods, or sufficient discussion of traceability and measurement uncertainty to ensure consistent practice in the calibration of calipers. H�b```f``�d`c`��� �� ,@Q�G���{�r�w��3� �,�u�|�Z6�Ӛ��+��4Nk>��x;g����nk-{�t۩��vfn��l��l�F���� a30 Y With the help of Vernier caliper we can calculate correctly up to 1/1000 th of centimeter or 0.1mm. Digital vernier caliper is used, this caliper should be make a hardened stainless steel material. VERNIER CALIPER: The three elements of vernier viz. Caliper Calibration – How to Calibrate a Caliper. 0000014595 00000 n
Vernier Calipers fall under the category of high precision measuring instruments meaning they provide measurements very precise in nature often accurate to the hundredth of a millimeter. trailer
<<
/Size 86
/Info 43 0 R
/Root 48 0 R
/Prev 167224
/ID[<3db1fe91116b1e3a8979c5eefb507a4a>]
>>
startxref
0
%%EOF
48 0 obj
<<
/Type /Catalog
/Pages 42 0 R
/Metadata 41 0 R
/PageLabels 39 0 R
/AcroForm 49 0 R
>>
endobj
49 0 obj
<<
/Fields [ ]
/DR << /Font << /ZaDb 36 0 R /Helv 37 0 R >> /Encoding << /PDFDocEncoding 38 0 R >> >>
/DA (/Helv 0 Tf 0 g )
>>
endobj
84 0 obj
<< /S 161 /V 280 /L 302 /Filter /FlateDecode /Length 85 0 R >>
stream
SINGLE PAGE PROCESSED JP2 ZIP download. Our lab experts have years of experience and are very familiar with industry standards and regulations. Make sure the measuring faces are clean. Zero the Vernier Caliper at the start and adjust as required by the manufacturers’ specifications. Both scale having the number of division. Length: 0 days CEUs: PDHs ... verification, and calibration of calipers, including vernier, dial, electronic digital, and specialty calipers. Calibration of Vernier Caliper Learn how to verify the performance of Vernier Caliper used for measurements in Quality Control. download 1 file . How to Read a Vernier (caliper): Looking at an early caliper, you’ll notice that it kinda looks like a tomahawk and has a scale down it’s length. Practice On Reading A Vernier Caliper Mini Physics. This scale is also known as “Main Scale (M.S)”. Vernier caliper Make : Range : Least count: Principle: The principle of vernier is that when two scales or divisions slightly different in size are used, the difference between them can be utilized to enhance the accuracy of measurement. 0000010647 00000 n
THAT, is the vernier part of the caliper. The article lists down the four attributes that buyers should look for in a vernier caliper like cost effectiveness and quality. $39. Asliding jaw which moves along the guiding surface provided by the main scale is coupled to a vernier scale. A vernier caliper does not easily lose its calibration but a sharp impact or accidental damage to the measuring surface in the caliper jaw can be significant enough to displace zero. It’s really very helpful. (The scales have been enlarged for easier reading.) 0000003215 00000 n
= mm / 25.4 (50mm = 1.9685 ins.) However, calipers are measuring instruments with fairly loose performance tolerances that may be candidates for in-house calibration if you have the right tools in place. Rhopoint Metrology offers digital vernier caliper calibration. ACM Laboratory offers a NATA accredited service for the calibration of the callipers (vernier, digital or dial type). Note that the important region of the vernier scale is enlarged in the upper right hand corner of each figure. 0000001127 00000 n
0000011484 00000 n
0000002585 00000 n
If you cannot zero it then mark it as a fail . Fowler 52 058 012 Stainless Steel Fine Adjustment Vernier. 0000007716 00000 n
5.3.4 Ensure “zero “reading with the jaw closed. v The least count of the apparatus is 0.01mm. Brown Immediately. %PDF-1.5
%âãÏÓ
4. 0000006915 00000 n
0.000150” (There is currently no stated figures for micrometers or digital calipers in the work instruction.) The Vernier caliper is calibrated in metric units. and we'll put the decimal point in. What makes a Vernier caliper unique from other types of calipers is the inclusion of a vernier scale which enables these calipers to be even more precise. 1.8 Calibration of vernier caliper: 1.7.1 Calibration frequency: Yearly 1.8.2 Calibration of Dial Vernier Caliper shall be done from External NABL Approved Laboratory. H�Y� ��X����Xl�(?K��%�i
�78�*xVpM����T �
���\�! startxref
0000068219 00000 n
Sine Bar: Working Principle, Construction, Formula, Limitations & Viva Questions [PDF] In the last session, we had discussed Marking and Measuring Tools used in Engineering Workshop. VERNIER CALIPER: The three elements of vernier viz. History. US Government Documents. 0000009977 00000 n
Before taking the measurement with vernier caliper, the vernier scale zero and main scale zero should be exactly in front of each other. @�q�0pL8���/6�. Vernier Calipers BS 887 : 2008. The main cause of calipers becoming uncalibrated are chips getting in the rack and causing the pinion to skip teeth on the rack. 550 kB. Vernier Calipers. 1.20 Related Products. 0000006284 00000 n
Title of Legally Binding Document: Vernier Calipers, Part 2: Vernier Calipers with Least Count 0.02 mm Number of Amendments: Equivalence: Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New--Jawaharlal Nehru Invent a new India using knowledge.--Satyanarayan Gangaram Pitroda 0000000776 00000 n
SINGLE PAGE PROCESSED JP2 ZIP download. … CALIBRATION PROCEDURE FOR MICROMETERS, MICROMETER HEADS AND DEPTH MICROMETERS ... 3.8 For Caliper TIs with interchangeable anvils and Electronic Digital TIs : Calibrate the Standard End Measuring Rods IAW T.O. 5.4 Vernier or Dial Calipers.-A measuring device which consists of a main scale with a fixed jaw and a slidingjawwithan attached vernierand is used toobtain precise inside, outside, or depth measurements. The information in this document applies to the caliper form types shown above. Digital wicketkeepers do not have a line of graded measuring scales. 0000033389 00000 n
the beam, the fixed jaw and the sliding jaw permit substantial improvements over direct measurement with graduated rules. 5.3.3 For vernier caliper press on key with the jaw closed. Digital Vernier Calipers only need one scale to be verified . These notes are to supplement your regular textbooks, not to replace them. shaving cyl head squish jetting questions REV Chassis. INTRODUCTION The automobile industries the calibration is required. Vernier Caliper Buying Guide. %PDF-1.4
%����
Description. Affix the calibration status label on vernier caliper. 0000012258 00000 n
download 1 file . Notice that the line for the 0 (zero) is to the right of the second line after the number 3. INTRODUCTION: The dead-weight tester is a device used for balancing a fluid pressure with a known … Since we know that there is a large number 1 to the left of the image that we can't see (which signifies 1 whole inch), let's write that down (1.) IS 3651-1: Vernier Calipers, Part I: Vernier Calipers with Least Count 0.1 mm and 0.05 mm Item Preview > 33K6-15-1 dated 28 February 2007 and Change 1 dated 30 April 2007. 0000012236 00000 n
The New American Standard for Digital, Dial, and Vernier Calipers James G. Salsbury Mitutoyo America Corporation 965 Corporate Boulevard Aurora, IL 60502 Phone: 630-723-3619 Email: [email protected] Abstract A new American National Standard for digital, dial, and vernier calipers, ASME B89.1.14, was The most internationally widely used caliper standard (DIN Vernier calipers are a form of highly accurate measuring device that gauges to the thousandth of an inch the distance between two symmetrical sides opposing one another on an object. A Guide To Ammunition … 6501 0 obj<>
endobj
0000114550 00000 n
6501 24
Read the following Vernier caliper measurements. 0000001927 00000 n
Resolution of Vernier Caliper: 0000002211 00000 n
Specification Standards. 0000001751 00000 n
A Vernier scale on caliper may have a least count of 0. Some vernier calipers have sliding scales that may be adjusted. The article lists down the four attributes that buyers should look for in a vernier caliper like cost effectiveness and quality. The vernier reading can be compared directly against a "wrung" stack of gauge blocks to check point to point measurement between flat surfaces. We made an attempt to make Physics easy and interesting. 6503 0 obj<>stream
1µm (0,001mm) ins. This means that, as the caliper jaws open, each successive movement of 0.05mm brings the succeeding vernier scale line into coincidence with a main scale line and so indicates the number of Alternatively a ring gauge can be used to check whether the "knife edge" of the caliper jaws have "worn flat", thus introducing errors when measuring internal diameters. xÚb```b``¾ÎÀÆÀÀnÊ È€ ‚¬@Q.ˆ�ÁfCİÒnSgÒHˆ
Ğşá"�"ÕÀİÑúÂQe�›ƒCR…Ò76
–�O~_ğèÃ2‹´-zO¸ƒ“˜Å–0èNPVàºÂ=�ı»ß¡äÌ�ç%�MYª,.ó¦WÛ+hbw_ű‰½š
È ¨M%¸_fa§Èã» RtfaèÜæs¥ î��…S#rŸ‹½Ú(³ĞMõXhâ¶~ËÒv�¤X–ğù©G@Üò0–¢V‰i1µO‘¸Óï¡È¢s%CÛnÙ!xJ$)&5L:ãót…ÂÖ._‡Ç=
IúÙT´õ÷G É€%¡Å@Æ)ƒÖi©`Çd²w(.‹\^!äƵ.‘Sh뉼7-lE¥GE«”%7mîSÁı_K-8ºë*ÈUqG›å6ºº=Dkä6[}o×U°±Õb. JIS Standard; AS1984; AS1984 is the Australian standard for callipers and at the moment does not specifically cover digital & dial callipers or callipers with 0,02mm … Metric calipers measure lengths up to a maximum of 1000mm using a main scale and vernier scale graduated to read to 0.02mm. Calibration Verification; External Audit Reports; Newsletter; Contacts; Animal Care Services; Core Research Equipment & Instrument Training Network (CREAIT) Research Data Lifecycle ; Research Computing; Cryogenic Facility; ... Vernier Caliper Procedure. 2. Mostly, vernier calipers have a range of 6 inches i.e. About digital calipers digital calipers - also called electronic caliphs. Scope All calipers used to measure, gage, test, inspect and control part compliance to customer specifications and drawings. 0000101353 00000 n
0000008370 00000 n
1. “TS-0070 Vernier Caliper Calibration Record Sheet” must be used . WASSCE WAEC Physics Syllabus larnedu com. 0
Vernier Dial and Digital Caliper Calibration Services ATS’ reputable calibrations department offers a wide variety of precision equipment services including caliper calibrations. 2. APPARATUS: Vernier Caliper, Digital Vernier Caliper, Different Components. Amazon com Large Size Vernier Calipers Calipers. 0000009216 00000 n
Vernier Calipers Lab 1 Density Determinations and Various Methods to. Digital calipers, vernier calipers, digital height gauges are UKAS calibrated. EN. 300mm. Mechanical Calibration and Performance Verification Test USP Apparatus 1 and Apparatus 2 Version 2.0 Page 1 of 16 Dissolution Toolkit Procedures for Mechanical Calibration and Performance Verification Test Apparatus 1 and Apparatus 2 ... micrometer and/or a vernier caliper to measure dimensional requirements. The Vernier scale is attached to the caliper’s slider and each division on this scale is made 0.05mm shorter than one main scale division of 1 mm. 5.1 Vernier calliper gauges 0 - 150 mm only one standard is used: the calibration certificate gives the expanded uncertainty: U(le)=0.1 µm+1⋅10-6⋅l ; k=2 standard uncertainty is therefore: u1(le)=U(le)/2 0.05 µm+0.5⋅10-6⋅l 1 5.2 Vernier calliper gauges greater than 150 mm (CMM is used) The range of digital vernier caliper is 0-200 mm. VERNIER CALIPER PRECAUTION: 1. 5.3.1 Calibration of vernier caliper following standard calibrate equipment are as follow 5.3.2 Calibration can be done in-house or by an external party. 0000004831 00000 n
Vernier Calipers Made Easy for Physics Students and Teachers Jitender Singh Shraddhesh Chaturvedi PsiPhiETC 2017. c rom www.concepts-of-physics.com Read Me First! The sliding jaw at its left extremity contains another measuring tip juxtaposed against the tip of the fixed jaw. PSLE Oral examination tips Study Room. 5.3.5 Open the jaw. 5.3 Calibration procedure 5.3.1 Calibration of vernier caliper following standard calibrate equipment are as follow 5.3.2 Calibration can be done in-house or by an external party. trailer
L0911Q. 0000009998 00000 n
Calibration of Vernier Caliper Operation v Ensure that the instrument is clean and free from sticky dirt matter. (The 1.Remove any contamination and clean the surface plate, gauge base, and scribe reference surface. 0000056661 00000 n
058 Measuring Rods for caliper and micrometer calibration. Its use was described in detail in English in Navigatio Britannica (1750) by mathematician and historian John Barrow. The micrometer screw gauge is used to measure even smaller dimensions than the vernier callipers. Verify T.O. Vernier Caliper: A device which is used to measure small lengths or distance such as diameter of a cylinder or sphere is called Vernier caliper. ... PDF Downloads; File Name File Size Language; 7151 Data Sheet. Range of Vernier Caliper: The range of a vernier caliper is the difference between the largest value and the smallest value that a caliper can measure and It is equivalent to the length of the main scale. The callipers are measured in environmentally (temperature) controlled (20 ± 0.5 ˚C) laboratory. 0000006710 00000 n
0000005316 00000 n
Calibration of Vernier Caliper Learn how to verify the performance of Vernier Caliper used for measurements in Quality Control. This can be seen if the dial is not returning to zero when closed… Remove cutting chips, dust, burrs and other foreign substances from the piece to be measured. ISO 13385-1 provides for the international definition of the design and metrological characteristics of calipers important in the specification, manufacture, and … Calibration of Vernier Callipers . This accuracy is achieved by the use of a vernier scale attached to a main scale which makes the vernier caliper different from other calipers.. The New American Standard for Digital, Dial, and Vernier Calipers James G. Salsbury Mitutoyo America Corporation 965 Corporate Boulevard Aurora, IL 60502 Phone: 630-723-3619 Email: [email protected] ... of the resolution. JN Juliet Nhidza Nov 2, Retrograde verniers are found on some devices, including surveying instruments. 0000068013 00000 n
1µm (0,001mm) ins. More about the. 2.Lower the scribe and bring the reference plane into good contact with the surface plate. Vernier or dial calipers should meet the requirements of Federal SpecificationGGG-C-11lB.Inch-poundscalevernierordial Important information regarding ASME PDFs. PURPOSE This working instruction can be applied to the verification of new Vernier callipers or the calibration of Vernier callipers in service and af-ter repair with scale division values of 0.02, 0.05 and 0.10 mm and with a measuring range up to 1000mm. <<555e1f687639234d9be7bb1acdceb666>]>>
5.3.4 Ensure “zero “reading with the jaw closed. The basket mesh cylinder should be at right angles to the plane of the bottom and top … TS-0070: Vernier Caliper Record Form TS-0049: Outside Micrometer Procedure TS-0071: Outside Micrometer Record Form TS-0050: Height … Precautions: Clean the caliper before use. 0000001785 00000 n
0000007695 00000 n
The information in this document applies to the caliper form types shown above. Specification Standards JIS Standard AS1984 AS1984 is the Australian standard for callipers and at the moment does not specifically cover digital & dial callipers or callipers For calibration of verniers, calipers, micrometers and depth gauges, Time Electronics 7151 includes gauge blocks and extras for comprehensive dimensional calibration. Conversion: mm to ins. IN COLLECTIONS. CNC Lathe Calibration Record Form: TS-0057 : CNC Mill Calibration Procedure TS-0079: CNC Mill Calibration Record Form TS-0058: Wilt Oven, Model 200 Calibration Procedure: TS-0080 : Wilt Oven, Model 200 Calibration Record Form TS-0059: Wilt Oven, Model 120-B Calibration Procedure TS-0081: Wilt Oven, Model 120-B Calibration Record Form: TS-0060 download 14 Files download 7 Original. Caliper Calibration: Calipers can need calibrated to maintained accuracy. The kit contains a 47 piece grade 1 metric gauge block set, with each gauge made of hardened alloy steel with a high quality surface finish. TORRENT download. 2. Calipers Inside jaws Vernier Caliper Nomenclature Absolute Digimatic Caliper Special Purpose Caliper Applications How to Read the Scale Graduation 0.05mm (1)Main scale 16 mm (2) Vernier 0.15 mm Reading 16.15 mm Graduation 0.01mm (1)Main scale 16 mm (2)Dial 0.13 mm Reading 16.13 mm Depth measuring faces Outside measuring faces Inside measuring faces Step measuring faces Outside jaws … National Accreditation Board for Testing and Calibration Laboratories Doc. Measuring Rods for caliper and micrometer calibration. ~ 0.00004 ins. WASSCE WAEC Physics Syllabus larnedu com.
0000005819 00000 n
(a) (b) (c) (d) (e) 130 Section 2, Lesson 4 Essentials of Mathematics 11 123 4 56 123 4 56 123 4 56 123 4 56 123 4 56 Applied Math 10 - Worksheet 1-3 (f) 2. Vernier calipers must be accurate to one hundredth of this figure i.e. 0000005287 00000 n
The callipers are measured in environmentally (temperature) controlled (20 ± 0.5 ˚C) laboratory. 0000000016 00000 n
How to Use a Vernier Caliper: 10 Steps (with Pictures) – wikiHow. 0000100499 00000 n
5051+ Multifunction Calibration System. Asliding jaw which moves along the guiding surface provided by the main scale is coupled to a vernier scale. 0000023871 00000 n
Two such instruments that are based on a vernier scale which you will use in the laboratory to measure lengths of objects are the vernier callipers and the. 33K6-4-369-1 still meets the requirement . Traceable@ Certificate of Calibration for Digital Calipers 150 mm Instrument Identification: 72281283 Manufacturer : Control Company NIST Traceable Referençe 1000208994 Cal Due: 5/24109 Model: 3418 SIN: Serial Number 99146223 Du Dat 8/04/07 Cal Date: 5125/07 Standards/Equipment: Description Gage Block Set Certificate Information: Technician: 57 Test Conditions: Procedure: CAL-05 … The Mitutoyo Institute of Metrology provides educational courses and on-demand resources across a wide variety of measurement related topics including basic inspection techniques, principles of dimensional metrology, calibration … The recommended sizes for Gage Blocks are X.210, X.420, X.605 and X.815 inch and full range, where X … 5.3.4 Place the tablet in between the upper jaws of Vernier Caliper by rotating the adjustment screw. At the moment the calibration work instruction states: "Verniers are used to measure to an accuracy of 0.015”. Read the following Vernier caliper measurements. Description. 1.9 Maintenance: 1.9.1 Inspect the Dial Vernier Caliper for any signs of damage, such as indications that it … 1. Check the step-measuring feature (if … = mm / 25.4 (50mm = 1.9685 ins.) Digital calipers have zero set buttons, for quick recalibration. Make sure that the zero lines of the vernier scale coincide with the zero lines of the main scale when the external jaws are closed. Determine the average length and record the observations. The set is housed in a … 0000011463 00000 n
%%EOF
The 7151 is a comprehensive kit for dimensional calibration applications including verniers, calipers, micrometers, and depth gauges. Global Public Safety Codes. The secondary scale, which contributed extra precision, was invented in 1631 by French mathematician Pierre Vernier (1580–1637). Due to this, it is important to calibrate the caliper using the same units of measure (inches or mm) as the applicable MPE value and not convert the measured … Vernier Calipers 1. 1. Ankur Choudhary Print Question Forum No comments PROCEDURE Place the standard Lengths of 25 mm between the measuring jaws of the caliper at three different positions and determine the length. 33K6-4-369-1 . shaving cyl head squish jetting questions REV Chassis. ISO 9001 requires calibration for gage blocks, micrometers, pin gages, calipers and thread gauges; according to Industrial Calibration Services (In-Cal), the standard also calls for calibration of a variety of digital measuring devices, including voltmeters, oscilloscopes and power supplies. 0000001741 00000 n
0000114816 00000 n
0000048505 00000 n
Conversion: mm to ins. CALIBRATION PROCEDURE FOR MICROMETERS, MICROMETER HEADS AND DEPTH MICROMETERS GENERAL This publication replaces T .O. 0000005674 00000 n
0000001385 00000 n
Make sure the measuring faces are clean.