Introduction The Model TMD90 dual input thermometer accepts Type K, J, T, R, S, and E thermocouples. With a triple display screen to view measurement results and relative time clock. Optional RS-232 software and cable allows collection of real time data to a PC for further analysis or reports. TMD90 displays all LCD (liquid crystal display) segments for approximately 3 seconds when it is first turned on and then provides information on any connected thermocouples. Numerous viewing combinations are available. The LCD is divided into three distinct sections; one large (Primary) top screen and two smaller bottom screens (Secondary and Relative Clock). The three display areas are continually updated with the temperature measurements and relative time information. There are several options regarding how and what information is presented on the LCD.