Calibration Certificate

Northgate Calibration Ltd

UKAS 0417

NCL-2026-00001

Revision 1 · Issued 2026-09-09

Calibrated by: J. Moreno Reviewed by: J. Moreno Environment: Relative humidity 44 %RH · Temperature 20.3 °C

Instrument: Digital caliper 0–150 mm

Asset Tag: CAL-0091

Manufacturer: Mitutoyo

Model: 500-196-30

Serial: A2318804

Calibration Date: 2026-09-09

Decision Rule: guardband

Worst-case TUR: 1.73

Result: CONDITIONAL

Condition as received: in tolerance.

Calibration Results

Point	Nominal	Tolerance / limits	As-Found (mm)	Error (AF) (mm)	As-Left (mm)	Expanded U	TUR	Status (as-left)
10 mm	10 mm	± 0.02 mm 9.98 – 10.02 mm	10.003	0.003	10.003	± 0.012 mm (k=2)	1.73:1	PASS
50 mm	50 mm	± 0.02 mm 49.98 – 50.02 mm	50.012	0.012	50.012	± 0.012 mm (k=2)	1.73:1	CONDITIONAL specification met (within tolerance) but inside the guard band, so NOT accepted under the guard-banded rule; probability of non-conformance if treated as accepted: 8.3% (normal, u = U/k)
100 mm	100 mm	± 0.02 mm 99.98 – 100.02 mm	100.019	0.019	100.019	± 0.012 mm (k=2)	1.73:1	CONDITIONAL specification met (within tolerance) but inside the guard band, so NOT accepted under the guard-banded rule; probability of non-conformance if treated as accepted: 43.1% (normal, u = U/k)
150 mm	150 mm	± 0.03 mm 149.97 – 150.03 mm	150.011	0.011	150.011	± 0.012 mm (k=2)	2.59:1	PASS

Decision rule (ISO/IEC 17025 §7.8.6)

Guard-banded acceptance (ILAC-G8:2019 §4.2.2 / ANSI-NCSL Z540.3 method 6): a result is reported PASS only when it lies inside the tolerance by at least the guard band w = U (U = expanded uncertainty, k as stated per point); a result within tolerance but inside the guard band is reported CONDITIONAL with its probability of false acceptance (PFA, JCGM 106); a result outside tolerance is reported FAIL. Probabilities assume a normal distribution with standard uncertainty u = U/k about the measured value (JCGM 106). Rule agreed with the customer before calibration.

Calibration conditions

Procedure	NCL-DIM-004 · Calibration of digital calipers to 150 mm · rev 1
Environment	Relative humidity 44 %RH · Temperature 20.3 °C
Location	laboratory premises
Customer	not recorded
Item received	not recorded (calibrated without an inbound order)

Reference standards (traceability)

Description	Certificate	Traceable to	Cal date	Cal due
Grade 0 gauge block set (steel, 1–100 mm)	UKAS-0332-24-1187	NPL U=0.00021 mm (k=2, 95.45 %) calibrated by UKAS 0332 · NPL	2026-06-01	2027-06-01

Specification provenance

Tolerance source	Mitutoyo 500-196-30 datasheet (AI-extracted, human-approved)
Document	Mitutoyo Digimatic Caliper 500 series datasheet, rev 2024-03, § Table 2 (accuracy ±0.02 mm ≤ 100 mm, ±0.03 mm ≤ 150 mm)
Statement	Tolerances derived from a manufacturer datasheet by AI extraction, reviewed and approved by a qualified person before use.

Electronic signatures (record hashes)

J. Moreno — Performed calibration
2026-09-09 04:47:57
sig:07cb7a7ecbbdcac1dfe784396a7db97ed9e2c40553b2b57af7371e4e98cf2d6f

J. Moreno — Approved calibration
2026-09-09 04:47:58
sig:20ed6596e812b19e8bb3080964a764cb8bb13a2f9da91a4576a8a778f39f9a45

The measurement results are metrologically traceable to the SI through the reference standards listed. Expanded uncertainties are reported at coverage factor k=2 (≈95 % confidence). Expanded uncertainties are shown to two significant figures; the test uncertainty ratio and any probability of non-conformance are computed from the unrounded uncertainty. Results relate only to the item calibrated. The calibration covers only the points listed; functions and ranges not listed were not calibrated. Where the item was not adjusted, the as-found and as-left values coincide and the stated uncertainty applies to both. Issued under the laboratory's accreditation UKAS 0417; the results reported are within the accredited scope unless marked otherwise.