Free tape measure calibration record

• The MapTrack tape measure calibration record contains 31 checks across 6 sections. Sections covered: Reference standards & environment, Blade condition, Length test points, Temperature correction, NMI verification, Certification & records.
• Tape details: make and model, serial number, asset or ID number, length (typically 5, 10, 30 or 50 metres), blade material (steel, fibreglass or composite), AS/NZS 1865 class (I, II or III), trade-approved status and last calibration date
• Reference rule or benchmark: serial number, class, length, last NMI calibration date and certificate number for the reference standard used in the check
• Calibration points: indicated reading at 1 metre, 5 metres, 10 metres, 30 metres (and any additional points relevant to the tape length and intended use), deviation from the reference and pass or fail against the AS/NZS 1865 class tolerance

Learn more about compliance and inspections in MapTrack.

• Survey and take-off defensibility: a documented tape calibration record allows a building surveyor or quantity surveyor to defend a measurement in front of a client, a builder or a tribunal when the dimension is challenged
• Class I, II or III accuracy clarity: the log captures which AS/NZS 1865 class the tape meets and confirms that the right tool is in the hands of the right user for surveying, general construction or industrial measurement work
• End-hook integrity: the movable hook adjustment is the most common source of systematic measurement error and a documented end-hook check catches damage or seizure before it produces inside or outside measurement bias
• Thermal correction discipline: steel tapes used in the field at temperatures other than 20 degrees Celsius require a correction (approximately 11 micrometres per metre per degree Celsius) that the log prompts the operator to record and apply
• Trade-measurement defensibility: documented internal checks and current NMI verification stamps protect a tape used in a trade-measurement transaction from short-measure prosecutions under the Trade Measurement Act 1960
• Reference rule traceability: recording the reference rule serial number, class and last NMI calibration date confirms that the reference itself was within tolerance and traceable to the national standard
• Drift detection: a trend of as-found readings over multiple checks reveals slow drift from tape stretch, blade kinks, hook wear or print scale damage before it affects survey deliverables
• Sector flexibility: a single log structure supports use across surveying, construction QC, manufacturing inspection and trade-measurement officers without rework

• Tape details: make and model, serial number, asset or ID number, length (typically 5, 10, 30 or 50 metres), blade material (steel, fibreglass or composite), AS/NZS 1865 class (I, II or III), trade-approved status and last calibration date
• Reference rule or benchmark: serial number, class, length, last NMI calibration date and certificate number for the reference standard used in the check
• Calibration points: indicated reading at 1 metre, 5 metres, 10 metres, 30 metres (and any additional points relevant to the tape length and intended use), deviation from the reference and pass or fail against the AS/NZS 1865 class tolerance
• End-hook condition: visual check of the movable hook for damage or seizure, measurement of the hook free play (should equal the hook thickness for correct inside/outside measurement) and pass or fail
• Blade condition: visual check of the blade for kinks, twists, missing or damaged print scale, rust on steel tapes and edge damage that could affect the hook engagement
• Thermal correction: ambient temperature recorded against the calibration, correction applied for steel tapes used outside the reference temperature of 20 degrees Celsius and the correction value documented
• Tension applied: the tension under which the calibration was performed (typically 50 newtons for surveying tapes, light hand tension for general construction tapes) recorded against the result
• NMI verification record: trade-measurement servicing licensee name, licence number, verification date, current stamp and next verification due date for trade-use tapes
• Sign-off: technician declaration and signature confirming the calibration has been performed correctly and the tape is fit for service
• Defect record: any failed calibration point with the action taken (adjustment, return to manufacturer, removal from trade use, disposal)
• Linked records: reference to the surveys, take-offs, inspection reports or trade transactions that the tape supported during the calibration period
• Storage and case condition: housing condition, blade retraction function and any drop or impact event since the last calibration check
• Adjustment record: any end-hook adjustment or replacement performed during the calibration with as-found and as-left readings recorded

1. 1. Prepare the reference and workspace

   lay out the reference rule or benchmark on a flat, clean surface (a calibrated steel rule or a marked benchmark traceable to NMI), confirm the reference is in date and record the ambient temperature and humidity of the workspace

2. 2. Inspect the tape blade and end-hook

   visually inspect the blade for kinks, twists, missing or damaged print scale and rust, check the end-hook for damage or seizure and confirm that the movable hook slides freely by exactly the hook thickness (this is the design feature that allows correct inside and outside measurement)

3. 3. Calibrate at 1 metre

   extend the tape against the reference rule with the appropriate tension applied (50 newtons for surveying tapes, light hand tension for general construction), align the tape zero (using either the end-hook for outside measurement or the 100 millimetre mark for inside measurement), read the indicated value at the 1 metre point and record the deviation

4. 4. Calibrate at 5 metres

   extend the tape to the 5 metre point against the reference, apply the standard tension, read the indicated value and record the deviation against the AS/NZS 1865 class tolerance (Class I plus or minus 1.3 millimetre, Class II plus or minus 2.7 millimetre, Class III plus or minus 5.0 millimetre at 5 metres)

5. 5. Calibrate at 10 metres

   extend the tape to the 10 metre point against the reference benchmark, apply tension and record the deviation, this is the most commonly used calibration point for construction tapes and any deviation here flows through to most everyday measurements

6. 6. Calibrate at 30 metres

   extend the tape to the 30 metre point against an outdoor benchmark or surveying baseline, apply 50 newtons tension for surveying tapes and record the deviation, apply the thermal correction for any steel tape used outside the reference temperature of 20 degrees Celsius (approximately 11 micrometres per metre per degree Celsius)

7. 7. Take action on any failure

   if any calibration point fails the AS/NZS 1865 class tolerance, mark the tape out of service for trade or surveying use, perform any end-hook adjustment per the OEM procedure if available and within scope, recheck the failed points and if still out of tolerance return the tape for replacement (most steel tapes are not field-adjustable beyond the end-hook)

8. 8. Sign off and schedule the next calibration

   sign the calibration record against the technician name and trade-measurement licence number if applicable, attach the reference rule certificate, file the record against the tape asset and set the next internal calibration date in the asset register

9. 9. Schedule NMI re-verification (trade-use only)

   for tapes used in a trade-measurement transaction, schedule the next NMI verification with a licensed servicing licensee per the published re-verification interval and update the verification due date in the asset register

Practical answers about the form, record keeping and using MapTrack.

This form is a starting point. Check the current requirements that apply to your equipment, work and location. The form alone does not establish compliance.

• AS/NZS 1865 (Tape measures)
• National Measurement Act 1960 and Trade Measurement Act 1960
• ISO 17025 (Calibration laboratory competence)
• OIML R35 (International tape measure standard)
• National Measurement Institute (NMI) verification requirements

MapTrack publishes this template. The linked authorities publish their own guidance; they haven't endorsed this form.

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