Certified, serialized and traceable and has been tested against a standard, calibrated at the National Institute of Standards and Technology (NIST).. Temperature-certified to monitor refrigerators or freezers. Probe is housed in a 5 mL, 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. Optional display formats for time, date, °C / °F. Flip-out desk stand, wall-mounting key hole and magnetic and hook-and-loop attachments allow multiple mounting options..