NABL Accredited · CC-2480 · Est. 2004 · Gujarat's Trusted Calibration Lab
NABL-accredited calibration for Gauge Blocks (Slip Gauges), Length Bars, Feeler Gauges, and Step Gauges. ISO 3650 traceable. Accepted by ISO 9001, IATF 16949, BIS auditors.
±0.5 µm
Uncertainty
0.5–1000 mm
Range
ISO 3650
Standard
ISO 3650
Gauge Blocks Standard
NABL Accredited
CC-2480
— WHAT IS LENGTH STANDARD CALIBRATION —
Gauge blocks and length bars are the foundation of your entire measurement chain. If a gauge block is out of tolerance, every instrument set with it will be wrong. Length standard calibration measures actual deviation from nominal under controlled temperature conditions per ISO 3650.
Measure
Actual length measured interferometrically or with NPL-traceable comparator at 20°C per ISO 3650.
Grade Check
Deviation, flatness, and parallelism assessed. Grade compliance (K, 0, 1, 2) confirmed.
Certify
NABL CC-2480 certificate with actual length and uncertainty — the root of your traceability chain.
— INSTRUMENTS COVERED —
Gauge Blocks · Length Bars · Feeler Gauges · Step Gauges · All grades · NABL accredited
Precision length bars in Grade A and B for reference length standards.
Gauge blocks (slip gauges) for dimensional reference and instrument calibration.
Feeler gauges for measuring gap clearances and setting tolerances.
Step gauges with multiple step heights for CMM and instrument verification.
— OUR PROCESS —
Length standard received, cleaned, visually inspected for surface damage. Grade and material documented.
Standards soaked at 20±0.5°C for 24 hours (gauge blocks) per ISO 3650 thermal equilibrium requirements.
Length measured with interferometry or NPL-traceable reference comparator at multiple points. As-found data recorded.
Surface finish, flatness, and parallelism assessed. Wringing quality verified (for gauge blocks).
Final length measurement confirmed. Deviation from nominal recorded. Grade compliance determined per ISO 3650.
NABL CC-2480 certificate with actual length, deviation, uncertainty (k=2), ISO 3650 traceability — ILAC MRA recognized.
— STANDARDS & COMPLIANCE —
ISO 3650
Gauge Blocks — Metrological Characteristics
ISO 10360
CMM & Length Measuring Machines
EURAMET cg-18
Calibration of Gauge Blocks by Comparison
ISO/IEC 17025
NABL Accreditation Standard
Prism holds NABL CC-2480 under ISO/IEC 17025:2017. Gauge block and length standard certificates are valid for ISO 9001, IATF 16949, BIS, and all audit purposes.
— NON-NABL CALIBRATION —
For in-house maintenance or workshops not requiring NABL certification — same engineers, same references, lower cost.
All non-NABL jobs use NPL-traceable reference gauge blocks — only the certificate type differs.
Non-NABL length standard jobs completed faster — ideal for urgent maintenance.
Priced lower than NABL — right choice for Grade 1/2 gauge block routine checks.
Available at our Ahmedabad lab and onsite across Gujarat — same team, same quality.
— AREAS WE SERVICE —
Gauge blocks are brought to our Ahmedabad lab for precision calibration. Door collection and delivery available across all Gujarat cities.
Why Choose Prism
Since 2004, every NABL gauge block and length standard certificate issued by Prism has been accepted by ISO, IATF, BIS, FDA, and GPCB auditors — no rejections, no rework.
— FAQ —
Get In Touch
Tell us the standard type, grade, and set details. We respond within 2 business hours.
— FROM OUR BLOG —
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Read MoreNABL Accreditation Disclaimer
Calibration services are provided under NABL Certificate CC-2480 in strict accordance with our officially approved scope of accreditation (ISO/IEC 17025:2017). Parameters or onsite conditions falling outside our active NABL scope are processed with standard metrological traceability to NPL/BIPM national standards.