1. This the signal generator and the version with MODBUS function. 2. Analog signals of voltage and current can be measured and output at the same time. 3. MODBUS function: you can use the upper computer software to set or collect data. 4. MODBUS function: can communicate with computer, PLC, DCS, intelligent meter and other devices. 5. High precision, wide range of applications, stable and efficient performance, real-time display on the same color screen, easy to operate. Supply voltage: DC 24V Product Function: Measure 0/2-10V, 0/4-20mA signal Output 0/2-10V, 0/4-20mA signal Display resolution: voltage 0.01V, current 0.01mA Accuracy: current 0.5% 3 words, voltage 0.5% 3 words Ambient temperature: -10-+70C Module size: L79mm x W43mm x H45mm Opening size: length 76mm x width 39mm Version Description: This version with MODBUS function, the difference is that it has an RS485 communication interface, which can be used to set up or collect data with the software of the upper computer, and can also communicate with computers, PLC, DCS, intelligent meters and other devices! Other than that, the other functions are the same! Instructions for use: Setting voltage: press P1, knob adjustment, lightly press knob to switch coarse/fine adjustment, press P1 to exit. Setting current: Press P2, knob to adjust, lightly press knob to switch coarse/fine adjustment, press P2 to exit. Set baud rate/communication address: Press SET key, knob to adjust, baud rate 4800-115200 adjustable, communication address 1-254 adjustable (Modbus version available). Key lock: press LOCK, all keys are invalid, long press 5 seconds to unlock. Communication Function: The Modbus version of this signal generator module supports RS485 interface Modbus RTU communication protocol. Colour:P Color Material:plastic Package Contents: 1 x signal generator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.