Contact Thermometer
Calibrate digital and liquid-in-glass thermometers to ITS-90 with NIMT traceability.
Standards
ITS-90, ASTM E2251, ISO/IEC 17025
Typical Interval
12 months
Uncertainty Range
±0.1–0.5°C
What Is Contact Thermometer?
Contact thermometers measure liquid, surface, and air temperatures in production processes, cold stores, and laboratories. Calibration to ITS-90 uses NIMT-traceable reference standards to compare readings at multiple temperature reference points.
Applicable Standards
Primary standards: ITS-90, ASTM E2251, 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 ±0.1–0.5°C, 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 Contact Thermometer Calibration Lab in Thailand
ThaiLabHub lists ISO 17025-accredited calibration laboratories across Thailand. Search our directory to find labs that offer contact thermometer services, with scope details, location, and contact information.
For Labs: Manage Contact Thermometer 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 Contact Thermometer?+
Temperature has a direct impact on chemical reactions, biological processes, and material properties. A Contact Thermometer that drifts even 1°C can invalidate test results or damage products. Calibration anchors readings to ITS-90 or relevant standards (ITS-90, ASTM E2251, ISO/IEC 17025) within ±0.1–0.5°C.
How often should a Contact Thermometer be calibrated?+
Most Contact Thermometers 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 Contact Thermometer 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 (±0.1–0.5°C), 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 temperature calibration
Nakhon Ratchasima Metrology Center
Nakhon Ratchasima
ISO/IEC 17025:2017Chiang Mai Metrology Center
Chiang Mai
ISO/IEC 17025:2017Phuket Marine Calibration Center
Phuket
ISO/IEC 17025:2017Rayong Petrochemical Calibration Center
Rayong
ISO/IEC 17025:2017Eastern Seaboard Calibration Center Chonburi
Chonburi
ISO/IEC 17025:2017National Institute of Metrology Thailand (NIMT)
Pathum Thani
ISO/IEC 17025:2017 (TIS 17025-2561)Related Calibration Services
Manage calibration with LabSync
Track instruments, schedule calibrations, and generate ISO 17025-ready certificates automatically.