Spa Instruments [I] Pvt. Ltd offers Process Indicator with Input 4 to 20 mA. Spa Instruments [I] Pvt. Ltd also manufactures transmitters, isolators, converters, controllers and valve actuators and technologically advanced electronic security devices. The Process Indicator with Input 4 to 20 mA, Model TR-100 Series, is used for carrying signal from field to control room. The Process Indicator with Input 4 to 20 mA supports T/C [J, K, R, and S] and RTD [PT-100] input. This Process Indicator has operating range of 12 to 32 V DC. This Process Indicator has ABS plastic head and rail mounting.