The DR10 (10 day) disposable temperature recorder is an inexpensive, one time use temperature recorder - indispensable for HVAC/R uses. It gives an accurate 10 day strip chart recording of a wide ambient temperature range. It can be easily changed on the job. After use, recycle it. Drop it in any mailbox using the postage paid return label. NIS traceable calibration. ABS Plastic enclosure. Temperature Range: -20 degree F to 100 degree F (-28 degree C to 38 degree C). Temperature Accuracy: +/-2 degree F (+/-1 degree C) or better. Day Spans: DR10 10 Day. Chart Resolution: 10 Day 2.50" per day. Power: 1.5 volt AA battery. Shelf Life: 1 year from date of purchase. Tamper-Proof: Pre-sealed at the factory. Case Quantity: 40 instruments. Measures 6-1/2" length by 3-1/2" width by 2-35/64" height. Weight: 10.5 oz (297.7 gm).