Hardness Tester
Calibrate Rockwell, Vickers, and Brinell hardness testers to ISO standards.
Standards
ISO 6506 (Brinell), ISO 6507 (Vickers), ISO 6508 (Rockwell), ISO/IEC 17025
Typical Interval
12 months
Uncertainty Range
±1–2 HRC / ±5 HV
What Is Hardness Tester?
Hardness testers are used in the metals industry, materials testing, and inspection of heat-treated components. Calibration is performed using certified reference hardness test blocks traceable to an ISO 17025-accredited laboratory.
Applicable Standards
Primary standards: ISO 6506 (Brinell), ISO 6507 (Vickers), ISO 6508 (Rockwell), ISO/IEC 17025
ISO/IEC 17025-accredited laboratories must maintain an unbroken traceability chain from the calibration result back to NIMT (Thailand's national metrology institute) or another internationally recognised NMI.
Typical Measurement Uncertainty
Expanded uncertainty is typically ±1–2 HRC / ±5 HV, depending on the measurement range, reference equipment used, and environmental conditions. The actual uncertainty will be stated on your calibration certificate.
Recommended Calibration Interval
A calibration interval of 12 months is generally recommended. The appropriate interval for your specific instrument depends on usage frequency, environmental exposure, and any applicable regulatory or customer requirements.
What Your Calibration Certificate Will Include
- Calibration results — instrument indication vs. reference value at each test point
- Error and expanded uncertainty (U) at k=2 (95% confidence level)
- Traceability chain to NIMT or a recognised NMI
- Environmental conditions during calibration (temperature, humidity)
- Calibration date, certificate number, and authorised signature
Find a Hardness Tester Calibration Lab in Thailand
ThaiLabHub lists ISO 17025-accredited calibration laboratories across Thailand. Search our directory to find labs that offer hardness tester services, with scope details, location, and contact information.
For Labs: Manage Hardness Tester Jobs with LabSync
LabSync helps Thai calibration laboratories manage jobs, issue traceable certificates, calculate GUM uncertainty budgets, and generate Thai tax reports (PP30 + WHT) — all in one system.
Frequently Asked Questions
Why is it important to calibrate a Hardness Tester?+
Dimensional measurements directly affect product conformance. A Hardness Tester that is out of tolerance can cause reject rates to rise or allow non-conforming parts to pass inspection. Calibration verifies the instrument reads within ±1–2 HRC / ±5 HV and maintains traceability per ISO 6506 (Brinell), ISO 6507 (Vickers), ISO 6508 (Rockwell), ISO/IEC 17025.
How often should a Hardness Tester be calibrated?+
Most Hardness Testers should be calibrated every 12 months under normal operating conditions. High-use environments, harsh conditions (vibration, temperature extremes), or regulatory requirements (FDA, GMP, ISO 17025) may necessitate more frequent calibration. Always follow the manufacturer's recommended interval as a baseline and consult your lab's quality plan.
What does a Hardness Tester calibration certificate show?+
A calibration certificate issued under ISO/IEC 17025 includes: the instrument identification (make, model, serial number), the reference standards used (with their own traceability chain), the measurement points tested, before/after correction values, the expanded measurement uncertainty (±1–2 HRC / ±5 HV), the environmental conditions during calibration, the calibration date and next-due date, and the signature of the authorized calibration engineer. This certificate is the evidence required for audits and accreditation.
Labs offering dimensional calibration
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