Specifications: Environmental Effects Temperature Range: -10C to 50 C Humidity (Non-Condensing 20 to 95% Accuracy ± 20% Reproducibility ± 10% Calibration ± 20% Linearity ± 20% Exposure Rate Limit 100 R/h (1 Sv/h Warm up time None Response time 5.4 sec time constant Adjustable carrying strap is Included Physical Characteristics Visual 2.62” round meter Detector Voltage 920 VDC Audio Panel mounted speaker 85 dBA min Power 2 - “D” cells 1 – “9v” battery Connectors Model 3020 headset Case Aluminum body & cover Finish Polyurethane enamel Controls 4 position selector switch (Off,x1,x10,x100) Weight 3.9 lbs ( 1.8 kg) Width 4.38 “ (111 mm) Length 8.75” (222 mm) Height 4.25” (109 mm)