GDT-3190 multimeter How to remove the black rubber for battery replacement - YouTube
Gardner Bender GDT-3190 for Sale in Ontario, CA - OfferUp
Gardner Bender GDT-3190 Digital Multimeter, 4 Function, 14 Range, Tests AC/DC Voltage, Resistance, and Battery, Manual Ranging, Auto-Off, 1/Each, Red With Black Rubber Boot - Multi Testers - Amazon.com