A midpoint-only calibration can hide accuracy drift at the edges of the operating range — right where regulated processes often live. iMatrix NIST variants are verified at multiple points across the humidity and temperature ranges.
A sensor may read perfectly at 50% RH but drift at 20% or 85% — the conditions you're actually trying to monitor in wine storage, vaccine freezers, or greenhouse operations. Single-point calibration certificates do not expose that drift. Multi-point calibration does.
Each NIST-variant sensor is tested at 3 or more points across the operating range in temperature- and humidity-controlled chambers at ISO 17025-accredited partner labs. Typical test points:
Deviations at each point are recorded on the calibration certificate. If deviation at any point exceeds the accuracy spec, the unit is rejected from the NIST batch and not shipped as a certified variant.
Every NIST calibration certificate includes:
The signed PDF certificate is archived in iMatrix Cloud under the sensor's serial number. Audit-ready export is one click. If the paper copy is lost, the cloud copy is authoritative.
Most regulated environments require annual recalibration. iMatrix offers a recalibration service: ship the sensor back, we calibrate at the same ISO 17025-accredited lab, and return it with a fresh certificate. Contact our services team to schedule.
We recalibrate sensors at the same accredited labs where they were originally certified.
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