Model YG 401 Digital Temperature Indicator Micro-controller based, micro-power, precision general purpose thermometer designed for used with type J, K, T, R, S, & RTD – PT100 sensors. Effect of Lead Wire: RTD - 1oC for 10% of nominal resistance per lead of 3 wire RTD's, TC's - 1oC for TC lead wire resistance of 100 Ohm.