Looking for an easy-to-use, reliable signal source? Look no further than this Digital 12-24V DC 4-20mA Signal Source Generator Constant Current Source. It’s easy to use and easy to wire, with a knob operation for stepless fine adjustment. There’s no delay in response after adjustment, so you can operate freely. The power port also has polarity protection, so your components won’t be damaged if power is reversed. The output load impedance range is 0-350 ohms for 12V DC power supplies or 0-800 ohms for 24V DC power supplies. The multimeter readings are the same whether you’re using the test output or not, so you can trust that this product will meet your needs.