This Revco 6383-6A F/S Seven Day Temperature 6" Circular Chart Recorder is in used condition and is guaranteed to be functional with a 30 day full money back return policy. This unit came from a local lab that had surplus inventory after upgrading equipment. We urge customers to view all photos as they show overall condition, included accessories and functionality. Please feel free to contact us with any questions. Thermo Scientific chart recorders record temperatures from -100 to 0 deg C; for use with most freezers and refrigerators. All 6" (152mm) circular chart, 7-day temperature recorders feature a temperature accuracy of +/- 0.25 deg C and use pressure-sensitive chart paper Seven-day chart recorders record temperatures from -100 to 0 deg C 6 in. (15.2cm) chart Maintain physical, accurate temperature data on pressure-sensitive chart paper, require no inking Freestanding model