| Grade | Main Elements | Max. Temp. Measurement | Limits of Error | Conforming Standards |
| Type K Quality Grade | 1250◦C | |||
| Isatherm Plus® KP | Ni-Cr | Standard/ | ASTM/ ANSI/ IEC/ DIN/ JIS/ |
|
| Isatherm Minus® KN | Ni-Al-Mn | Special | ||
| Type KX, Extension Grade | 200◦C | |||
| Isatherm Plus® KPX | Ni-Cr | Standard/ | ||
| Isatherm Minus® KNX | Ni-Al-Mn | Special | ||
Isatherm Plus® and Isatherm Minus® are Registered Trademarks of Isabellenhuette Heusler GmbH & Co. KG, Germany