0-10V/0-20mA Handheld Digital Signal Generator with Rechargeable Battery Pocket Adjustable Voltage Current Simulator Calibrator        Features:    1.Power Supply: built-in rechargeable battery (charged via micro USB port), external micro USB-5V, external power DC 15-30V, each way makes the generator work    2.Voltage Output: 0-10V, precision is 0.01V, rotate the encoder knob to adjust output voltage, can be calibrated.    3.Current Output: 0-22mA, precision is 0.01mA, rotate the encoder knob to adjust output current, can be calibrated.    4.Multiple Display: just push the small botton to switch the display 4.mode between voltage and current, you can also follow the instructions to switch 0-100 percent or 0-50HZ display    Description:    Size: 6*2.5*10CM    Power: Micro USB port or DC 24V    External Power Supply: DC15-30V 1W(Non charge)/5W(Charging)    External Connection micro USB- 5V: 0.2A(Non charge)/1A(Charging)    Adjustable Voltage Output: 0-10V, Precision: 0.01V, can be calibrated    Maximum Output Current: 20mA    Adjustable Current Output 0-22mA, Precision: 0.01mA, can be calibrated; sampling resistor is not more than 500Ω.        Package Included:    1 x Signal Generator(Without battery）