How to choose
K: 0~600 J: 0~400 PT100: -200~420
K type and J type looks same, just the material inside different, K type with bigger temperature range than J type .
But the actual situation depends on your temperature display device. If the device is K, the sensor must be K, if the device is J, the sensor must be J.
==========
Theory : Temperature Sensor
Display Type : analog
Power Type : None
Certification : None
Origin : Mainland China
Max Measuring Temperature : 120°C & Above
Style : Wall Hanging
Usage : Industrial
Cable Length : 1m 2m 3m 5m 6m 8m 10m