Assure customers of your quality control. Place this recorder on outgoing shipments to prove proper temperature is sustained. The Ryan EZT is a self-contained, battery-powered, tamper-proof instrument which tracks temperature versus time and plots the data on a strip chart. The wide and easy-to-read chart has a thick, bold trace which will photocopy and fax easily. Temperature range: -20º to 100ºF. Accuracy of 2.0ºF or 1.1ºC within the temperature range of 10º to 70ºF. Calibration is NIST-traceable. 20 each/case.