Dwyer 659RTD-1 is a push-button temperature transmitter that can measure temperatures in the range of -4 to 158°F (-20 to 70°C) with an accuracy of ±0.04% FS for T/C models and ±0.2°C for RTD models. It features a linearized 4 to 20 mA output, 2-wire loop powered, and has a loop resistance of 700 Ω @ 24 VDC for T/C and 800 Ω @ 24 VDC for RTD. The input range varies depending on the type of temperature sensor used. The transmitter also has a low output thermal drift and a burnout upscale of 22 mA.