The test caps feature a Lumberg connector and can be used with the thermometers and loggers listed below to check the instrument calibration. N1092 N9092 N9092R N9091 CF21 KM22 N2002 - internal sensor N2012 - internal sensor Each test cap simulates a specific reading in °C, relevant to the food industry, and is supplied complete with a UKAS certificate of calibration. The test cap is attached to the thermometer under test and the instrument reading can be compared with that produced by the test cap. Test caps save on calibration costs because only instruments that are out of specification when tested need be returned for service work. Test Cap Order Code TX21L TX22L TX23L TX24L TX25L TX26L TX27L Temperature Point -18°C -5°C 0°C +3°C +63°C +70°C +32°F