A standard metric tester is made of a stainless steel case, is powered by two AA batteries, and comes with a rotary display screen. The meter uses a mechanical wheel, and a mechanical display of figures; newer models have a…

A standard metric tester is made of a stainless steel case, is powered by two AA batteries, and comes with a rotary display screen. The meter uses a mechanical wheel, and a mechanical display of figures; newer models have a…