Comark uses the Lumberg connector on many products due to its ruggedness and ability to perform multiple connecting duties. However, this can lead to some confusion, for example, when a Thermocouple Probe, with a Brown or Green lead, is plugged into an instrument designed to accept only a Thermistor/PST probe (for example C20, or C21C).
Doing this will cause no harm to the instrument, or the probe, but the probe will not work correctly and the display may well simply show Ambient Temperature reading.
To confirm if this probe is working correctly please try this probe in a C22 or N9094.
If you believe that the probe has been ordered in error please return the probe so we can arrange an exchange.