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. Automatic storage of output value can be enabled 8. Programmable automatic curve output with 1-9 segments 9. Configurable 2-9 preset points for quick output adjustment; knob allows direct recall of stored currents 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 display differences may cause slight variation between the item color in the image and actual product. Measurement may vary by +/- 1-3cm.