This is a stainless steel Type-K Thermocouple probe for measuring temperature from 0 to 400°C. The thermocouple junction of the probe is grounded, providing faster respond to temperature change. The probe itself is 50mm long, 5mm diameter and with M8 thread. Total length of the sensor, including stainless steel braided cable, is approximately 1 meter long.
If you need a converter for this thermocouple probe, have a look at this breakout board.