This handheld current and voltage calibrator has a variety of signal measurement and output functions, including voltage, frequency, current, loop current measurement and voltage, frequency, active current, passive current output, etc. Keys with distinct functions, single operation room, easy to use, high precision, long standby time and programmable automatic output function. It is widely used in the debugging of PLC and process instruments, electric valves, etc. in laboratories and industrial sites. WXM100A has optional voltage measurement/output function WXM100B has the function of selecting voltage and frequency measurement/output Process calibrator 4-20mA output DC voltage Measurements 0～30 V/ DC voltage Output 0～15V Process calibrator 4-20mA output DC current Measurements 0～24 mA/ DC current Output 0～24mA Process calibrator 4-20mA output Loop current Measurements 0～25 mA 4-20mA output Process calibrator 4-20mA output Frequency Measurements 0～10kHz /Frequency Output 0～10kHz Process calibrator 4-20mA output DC voltage DC current Frequency Loop current The passive current 24V loop current