1. Passive two-wire 4-20mA current loop, wiring fully compatible with 2, 3, and 4 wire systems 2. 0.01 precision, liquid crystal display, encoder knob, terminal block has no polarity 3. Supports coarse and fine adjustment modes, number of turns can be set 4. Adjustable output range: 4-20mA (control equipment) or 3-21mA (debug signal) 5. Selectable display modes: actual current, 0-100.0%, or 0-50.0Hz 6. Linear output with calibration capability 7. Auto-store function for output value 8. Programmable automatic curve output with 1-9 segments 9. Configurable 2-9 preset points for quick output adjustment; knob allows direct recall of saved current values Technical specifications: 1.1 Power supply voltage: 15V – 30V 1.2 Output range: 4-20mA / 3-21mA 1.3 Display modes: Real Current / 0-100.0% / 0-50.0Hz 1.4 Sampling resistance: Less than 500 ohms 1.5 Output accuracy: 0.5%; Display accuracy: 0.01 Color: Grey Material: Plastic Package contents: 1 x Signal generator Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement error is +/- 1-3cm.