4” Data-Efficient Temperature Chart Recorder Long Life Battery Operation -- easy-to-use and portable for refrigerators, freezers, or any location. Accurate and Designed with Simplicity in Mind- • 4-inch readable chart (order separately)• 2-3 year battery life• Cord-free and portable• Digital display• Optional 7-day or 24-hour recording• NEW F/C Switchable• NEW Battery Door• NEW Hinged Door SL4350-22 to 122F -30 to 50C 24-Hour 7-DaySL4100 0 to 100F -18 to 37C 24-Hour 7-DaySL490 45 to 90F 7 to 32C 24-Hour 7-DayC181 4" Chart, -30 to +50°C, 7 DayC180 4" Chart, -30 to +50°C, 24 HourC206 4" Chart, -22 to +122°F, 7 DayC205 4" Chart, -22 to +122°F, 24 HourC210 4" Chart, -18 to +37°C, 7 DayC012 4" Chart, 0 to 100, 7 DayC209 4" Chart, -18 to +37°C, 24 HourC010 4" Chart, 0 to 100, 24 HourC208 4" Chart, +7 to +32°C, 7 DayC070 4" Chart, +45 to +90, 7 DayC090 4" Chart, 45 to 90, 24 HourC207 4" Chart, +7 to +32°C, 24 Hour