Answer: 3.5inches on U.S.A. nickel
Answer: 90dB (decibels)
Answer: Operating humidity: Non-condensing (avoid environments where moisture condenses on surfaces).
Answer:30-40 Hours (Alkaline Batteries)
Answer: 0°F to 160°F (–18°C to 71°C), without battery
Answer: Detects metallic objects as small as 3.3 mm (approximately 0.13 in) when on the surface.