How to measure a load’s core temperature reliably

Use the measurement method in the product procedure; record the instrument, sample location, and conditions with the lot.

25 November 2021Updated 23 September 2026

Short answer

First identify the measurement required by the receiving procedure. An infrared device scans the surface; it does not establish core temperature by itself. If a probe reading is required, use a suitable calibrated instrument at the specified sample point and record the result, time, method, and lot number. Do not assume a universal tolerance.

The receiving decision should use a measurement method suited to the product and contractual procedure. Surface, between-package, and product-core readings answer different questions.

Choose the method first

Use an infrared thermometer for surface screening. If the product core must be measured, follow the probe method in the procedure.

Record the sample and instrument

Note lot number, product, sample location, instrument ID, calibration status, time, and result. Let the receiving instruction define sample locations.

Compare the result

Assess the reading against current product specifications and the parties’ agreed acceptance method. Do not use a surface scan alone to reject or release a lot.