This thermometer has two temperature sensors—a built-in air sensor and an independent external probe sensor with 3 1/2 foot cable. The external probe can be used to monitor temperatures of liquids, air/gas, and semisolids. Alarm configurations can be set up for four conditions: temperature above a setting, below a setting, between two settings, or outside two settings. A green or red light will blink and an audible alarm will sound when one of these conditions is detected. The alarm will sound every minute for 5 seconds until the temperature returns to a non-alarm condition or until the alarm is turned off.