Technical Parameters Working voltage: DC220V ±10% The Sensitivity : Level 3 Adjustable Working Frequency: 100 Khz Sampling Time: 35ms Working Temperature: -40°C ~ + 65°C Relative Humidity : The Biggest 95% Stroge temperature : -40°C ~ + 85°C The Biggest Coil : 8m x 1m To Detect the Lead : Best 10meters Appearance Size : 38mm * 75mm*115mm