Pen Screwdriver Voltage Tester | Ac Electric Voltage Tester Pen - 100-500v Test Pen - Aliexpress
Tp-113 ASTM D130 Petroleum Products Copper Corrosiveness Tester Copper Strip Test Meter - China Copper Corrosion Tester, Copper Corrosion Testing Machine | Made-in-China.com
I see the Duracell power check batteries posted often but no one seems to remember the Copper Top Tester. I recently found my old one. Tested it out with a new battery. :
Duracell Copper Top Tester Taxi Commercial (1992) - YouTube