Test caps are a quick and convenient way to check thermometer units, doing away with many of the problems presented by ice and boiling water. Are they really the straightforward solution that they seem?
Test caps simulate the electrical current of a probe. 20 years’ worth of data shows that the majority of thermometer accuracy issues are with the probe, so if the thermometer is perfect but the probe is not reading correctly, test caps will not identify this.
Accurate and safeFast checking process with no set up requiredNot suitable for thermometers with integral probes Every test cap needs externally calibrating to UKAS standard each year
