Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? A digital multimeter is an indispensable tool for testing, diagnosing, and ...

They’re inexpensive and easy to use, and they help keep you safe when doing DIY electrical work. Solution: Test. Use. Verify.

Combining Cor Van Rij's JFET test socket with two DMMs, a current limiter, switches and a wall wart yield a simple, accurate JFET tester.