Tip Soldering Iron Temperature Tester FG-100 Thermometer for Welding Iron 0-700℃

Temperature sensor: K (CA)type thermocouple. MAX HOLD function: When the button "MAX HOLD" is pressed, "MAX HOLD" will be displayed and the highest temperature of Iron will be held in the display. Good temperature response using a fine CA wire sensor (φ0.2mm).

eBay