I want a datalogger for thermocouples that is so simple I can lend it to people and do NOTHING ELSE to support them.
It should accept subminiature (aka. “flat blade”) plugs.
It should write a .csv file to a USB drive.
It should have a switch that sets the sampling rate, a switch that sets the thermocouple type (no mixing types), and a switch that makes it go or stop, and no other controls.
It should have a display that shows how many readings it has taken, and shows the temperature on Channel 1.
Reasonably bright technical people should be able to tell how to operate it without any documentation or tutoring.
I actually used to have a multimeter with a K- type plug and a data logger that cost less than $50 but I was never to find that model again. It had a serial interface.