as every hard surface is different
Engineered to specifications required by professional electricians the Sperry Instruments VD6504 Non-Contact Voltage Detector features both audible (beeping) and visual (360 degree flashing red light) indicators to alert the user of the presence of AC voltage from 50V to 1000V
for use with electric dryers
Twist for secure installation
3V Photo Lithium Battery, E2 CR2 BLACK MAGIC as every hard surface isEnergizer E2, CR2, 3V, photo lithium battery, comparable to Duracell #DLCR2. 3 Volt e2 Photo Lithium Battery is designed for use with cameras, photoflash, calculators, pocket pagers, watches, memory backup and other high drain applications. 3 Volt e2 Photo Lithium Battery performs even in extreme temperatures. Storage life lasts up to 10 years.