Temperature chart recorder. Micro-controller design. Large LED display. Front panel controls. Single or continuous chart rotation. Battery backup. 12 Volt operation. Allows use in vehicular or marine operations. Comes with 2 car tridge pens and 60 (6" diameter) assorted charts. Convenient folding handle. Fold-out suppor t stand. Free standing or wall mount. Applications: designed for refrigerators/freezers, laboratory and environmental applications, measures and records temperature in air, gas, powders, solids, and semi-solids. Ambient operating temperature range: 32 degree F to 140 degree F. Ambient operating relative humidity: 96 Percent maximum. CR87J chart: 6 hours, 24 hours, 7 days. Chart rotation mode: Single turn or continuous. Chart speed accuracy: +/-1 Percent. Chart Diameter: 6 inches. Display: 3 digit LED 0.5". Primary power supply: 120 VAC, 50/60Hz. 12 Volt vehicle operation with optional adapter. Battery backup: (8) AA Alkaline batteries (not supplied). Battery life: 48 hours continuous use. Recording Pen: Ink type. Weight: 4 lbs, 7 oz. Temperature Scale Selectable (Fahrenheit): -40 degree F to 30 degree F, -20 degree F to 50 degree F, 50 degree F to 120 degree F. Temperature Accuracy: +/-2 degree F. Temperature Sensor: 15 long sensor wire with 4" stainless steel submersible temperature probe.