 Max 31 856 thermocouple amplifier. It is a universal thermocouple amplifier so it can use all the different types of thermocouple probes. A Feather M4 here and I've got this nice little display. My ambient temperature right now is 68.2 degrees Fahrenheit. I'll go ahead and plunge that in the icy ice water bath here and we can see we're getting down to around 37.8 degrees or so. Take that out and that will rebound I think faster if you're not using the metal ended probe just because that's got some thermal mass to it. If I grab that with my fingers there you can see I'm starting to raise that temperature pretty quickly and then this was some water I boiled for tea earlier so if I plunge that into there you can see we're quickly getting up to around 120 degrees or so Fahrenheit. It is the Max 31 856 universal thermocouple amplifier.