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 turnsset 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-save output value function 8. Programmable automatic curve output with 1-9 segments 9. Configurable 2-9 preset points for quick output adjustment via knob recall Technical specifications: Power supply voltage: 15V 30V Output range: 4-20mA / 3-21mA Display modes: Real Current / 0-100.0% / 0-50.0Hz Sampling resistance: Less than 500 ohms Output accuracy: 0.5% Display accuracy: 0.01 Color: Photo Color Material: Plastic Size: 79.5 x 42.2mm Package Contents: 2 x Signal Generator Note: Light reflection and different displays may cause slight color variation between the image and actual item. Measurement error allowed within +/- 1-3cm.