QTY Per Sell: 1 Triple display allows multiple mode options simultaneously showing high, low and current temperature or high, low and current humidity. Certified, serialized and traceable and has been tested against a standard calibrated at the National Institute of Standards and Technology (NIST). Temperature-certified with two probes to monitor refrigerators and/or freezers simultaneously Dual-probe unit, housed in an unbreakable plastic vial filled with a Bio-Safe Glycol / Water medium and allows internal or external sensor reading display Alarm display with real time and date stamp, low / high limit settings, with visual, flashing LED light and audible beeping indicators Flip-out desk stand, wall-mounting key hole and magnetic and hook-and-loop attachments allow multiple mounting options.