Traceable® Platinum Hi-Accuracy Refrigerator ThermometerTraceable Platinum Hi Accuracy Refrigerator Thermometer Traceable Platinum Hi Accuracy Refrigerator Thermometer with minimum maximum readings for last 24 hours, 7 days, 30 days Features: Displays minimum maximum temperatures for last 24 hours (for each hour) and last 7 days (for each day); or last 30 days (for each day) Time Date stamp key shows the exact time and date for all minimum and maximum readings 4 wire platinum bottle probe insures linear