Profile: Two Dimensional Instruments, LLC offers temperature recorders. Our products are temperature monitoring systems, freezer alarms, standard data loggers, network accessible data loggers and electronic hygrometers. Our TR-51A & TR-52 standard data loggers are easy to use, compact, water resistant one channel temperature data loggers that can be used in both normal outdoor conditions and in harsh environments as well as in environments where temperature varies greatly. Our thermaviewer is a battery-backed up, microprocessor based, monitor that logs and charts temperature or temperature/RH. It stores & displays a temperature history chart on its large panel display which can be scrolled through or zoomed into and out of, so that a temperature history of 3 hours or 1.5 years can be seen at one time.