Outside Micrometer
Calibrate outside micrometers for precision dimensional measurement to 0.001 mm resolution.
Standards
ISO 3611, ASME B89.1.13, ISO/IEC 17025
Typical Interval
12 months
Uncertainty Range
±0.001 mm
What Is Outside Micrometer?
Outside micrometers provide 0.001 mm (1 μm) resolution — 5–10× finer than vernier calipers — making them the standard tool for measuring shaft diameters, component thickness, and parts with tight tolerances. Calibration verifies scale accuracy and parallelism of the measuring faces.
Applicable Standards
Primary standards: ISO 3611, ASME B89.1.13, 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 ±0.001 mm, 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 Outside Micrometer Calibration Lab in Thailand
ThaiLabHub lists ISO 17025-accredited calibration laboratories across Thailand. Search our directory to find labs that offer outside micrometer services, with scope details, location, and contact information.
For Labs: Manage Outside Micrometer 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 Outside Micrometer?+
Dimensional measurements directly affect product conformance. A Outside Micrometer 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 ±0.001 mm and maintains traceability per ISO 3611, ASME B89.1.13, ISO/IEC 17025.
How often should a Outside Micrometer be calibrated?+
Most Outside Micrometers 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 Outside Micrometer 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 (±0.001 mm), 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
Related Calibration Services
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