These are very handy and prevent you from having to clip a lead to your probe so you can clip the other end to the circuit. However, if you look for a “test lead kit,” you’ll find many ...

【3-60V DC Wider Voltage Test Range】Compared with the Normal Test Light on the Market,This Test Light Maximum Measure Voltage is Upgrade to 60V,BOAK Auto Circuit Tester Ideal for Checking ...

A resistor and diode help protect the probe and the circuit under test. There are also a few LEDs and a buzzer. The rest of the project is software. The probe, of course, can do the classic ...