The Triple display digital thermometer simultaneously shows the current, minimum, and maximum temperatures and updates continuously. An audible alarm will sound when the temperatures rises above or goes below the set temperatures. The minimum/maximum feature monitors critical temperature for any period of time, such as overnight or weekend. Reset buttons on front panel. Each thermometer is certified and traceable to N. I. S. T. 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 and the bottle housing the probe have dual magnets allowing attachment to doors or walls of the instrument. Other features include a flip-open stand and wall mounting key hole.