The UEi DT20A Dual-Input Thermister Thermometer is a portable, battery operated temperature-measuring device that all users will love to use. It uses thermister probes to provide quick, accurate measurements with excellent resolution without all the other hassle. Any change in temperature is quickly reported to the user. UEi DT20A Dual-Input Thermister Thermometer comes complete with two replaceable, submersible metal probe (ATT55A), 3 (AAA) batteries, and manual.