The Renata Watch and Battery Tester detects defects in analog quartz mechanical watches. Also indicates battery voltage. Run the WATCH TEST before opening the watch to determine if it needs a battery change or a repair. Run the BATTERY TEST for high and low drain silver oxide, mercury, alkaline, and 3 volt lithium "CR" and "BR" batteries. The Renata Tester is powered by a CR2430 Lithium battery. Swiss made.
