Check the listing for details. HAKKO FG100B-03 Tip Thermometer. Condition: New. Listed at 275.62 USD. This unit does everything the FG-100 did, now with a new AUTO HOLD feature that ends measurements automatically once the tip temperature is stabilized. This feature can minimize individual differences in measuring temperatures. The FG-100B can also display in both °C and °F!To preserve battery life, the auto shutoff feature turns the thermometer off when not used for three minutes. The thermometer design allows for easy measurements from right or left handed operators.The sensor (P/N: 191-212) has a special metal alloy coating that resists corrosion and oxidation.Sensor replacement is quick and easyAUTO HOLD featureUser selectable easy-to-read temperature display allows the reading to display in either °C or °FOptional temperature probe to measure solder pot temperatures