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4-20mA Signal Generator, 3-21mA Adjustable High Precision DC Current Analog Simulator Two-Wire Transducer Test Signal Generator DIY Kit JS-420ISG-V2 hidden absorb moisture and maintain a4 20mA Signal Generator, 3 21mA Adjustable High Precision DC Current Analog Simulator Two Wire Transducer Test Signal Generator DIY Kit JS 420ISG V2 Features: This signal generator can use 4 20mA to generate voltage and control the current in the circuit. Accuracy up to 0. 01; Liquid crystal display; Rotary encoder adjustment ; Two connection terminals are non polarity. Output range can be set; 4 20mA (device control) 21mA (signal debugging) Display