@davelondon The ISO unit is electrically isolated. The thermocouple converter is isolated from the Unit and your M5Stack controller by a SPI isolation chip. see schematic: https://docs.m5stack.com/en/unit/KMeterISO Unit The standard Kmeter is not. -Terry

@davelondon No

Hello @davelondon I do not own the ATOM PWM Kit so my conclusions could be incorrect. But looking at the schematic the MOSFET (FDD8447L) used at the output is rated for 40 V. So yes, if the input is 24 V I'd say the output will be 24 V as well. Thanks Felix