Bidspirit auction | No. 28 Combination Tester for

No. 28 Combination Tester for Alternating Current Only 110 Volts 60 Cycles Wooden Base with Two Bulbs - A No. 28 Combination Tester housed in a wooden base, designed for alternating current only at 110 volts and 60 cycles. The unit features dual light bulbs mounted on top, exposed brass and metal hardware, wiring terminals, and mechanical contact points.