Digital Thermometer, Triple Display, with 5mL Vaccine Bottle, Freezer Applications, -20.0¿C Certified Temperature. Simultaneously shows the current, minimum, & maximum temperatures and updates continuously. An audible alarm will sound when the temperature rises above or goes below the set temperatures. The minimum/maximum feature monitors critical temperature for any period of time. Reset buttons on front panel. Each thermometer is certified and traceable to NIST and is supplied with a certificate with one critical temperature value calibrated with the reported results. Each thermometer is serialized. The thermometer probe is housed in an unbreakable plastic bottle or vial filled with a buffering media which maintains the thermometer reading when the instrument door is opened. The thermometer & the bottle housing the probe have dual magnets. Other features include a flip-open stand, wall mounting key hole, & supplied with an AAA alkaline battery. The instrument is ¿C and ¿F switchable.