1. Upgrade HT-NTC100K Thermistor: package temperature measurement. Temperature measurement head cylinder diameter 3mm, length 15mm, can be used with the same size heating block that support the thermocouple. Not for MK4 XL Nextruder heater block 2. The temperature measurement: -50 °C ~ +250 °C for a long lifecycle, sometimes can reach up to +300 for a short time using, can replace the original K-type thermocouple temperature, very fit for printing high-temperature filament. Please note that the temperature should not be over 300 °C, otherwise the temperature will not be accurate.) 3. The Customized Terminal Connector( XH2.54 2P with buckle) is specially for MK3/MK3S prus einsy boards, so please check before ordering. If need more support, please feel free to contact us via your order ID, we'll assist you directly 4. HT-NTC100K thermistor adopts white high-temperature cord, can bear higher temperature. And for customers' convenience, the wires adopts line connection, th