We have been using several serial and USB TC-08 with grounding.
We have recently procured two new USB TC-08 loggers that do not have the grounding option, and we get reading fluctuations of over 30C.
We cannot stop testing for the time it would take to ship this unit to the UK and back.
Please indicate what could be done to minimize these fluctuations and insure we would get the correct temperature readings from the K-Type Thermocouples.
Your prompt advice would be highly appreciated.