This unit is capable of supporting up to 1 or 2 channels with a recording time of 24 hours or 7 days. This unit is capable of dealing with measurements that range from -15 to +60°C, and of operating with a measurement accuracy of +-2% and a tolerance for HR from 0 to 100 %. The unit deals with circular diagrams that are printed on pre-impred paper. This device is also powered by a 1.5 V battery, and is graded with an IP 20 protection rating.