The ATH100KR8 series thermistor is consisted of three  versions, ATH100KR8,  ATH100KR8T63 and  ATH100KR8T63S. The ATH100KR8 has bear leads coated  with copper, the ATH100KR8T63S has the leads covered by  high temperature plastic tubing and sealed by epoxy, while  the ATH100KR8T63 is the non-sealed version.  The ATH100KR8 is a high precision glass encapsulated  thermistor. Comparing with conventional epoxy encapsulated  thermistors, ATH100KR8 presents higher long term stability  and wider temperature range. In addition, it has a small size  and short response time. In addition, there are two insulation  versions available, one of which comes with leads covered by  plastic tubing, the ATH100KR8T63, and the other one, the  ATH100KR8T63S, is sealed between the head and the tubing. The ATH100KR8 can be used to measure the temperatures  for laser diodes, optical components, etc., with high accuracy  and long term stability.