12 recorders in 1. For refrigerator, freezer and environmental temperature measurement. Measures and records temperatures in air, gas, liquids, powders and semi-solids. Temperature ranges of: -40�F to +30�F, -20�F to +50�F or 50�F to 120�F. Recording speeds of 6 hours, 24 hours, 7 days and 31 days. Selectable, single turn or continuous chart rotation. Remote reading 4" long submersible stainless steel probe with 15' sensor wire. Standard 120V operation/special 12V feature allows for use in vehicular or marine operation. Battery backup. Includes 60 assorted, 6" diameter charts and 2 pens