GAUSS METER Features: Three Range Dustproof Radiographic Survey Meter Rugged Two Piece Nylon Reinforced Fiberglass Case with Cast Aluminum Handle Large 3 1/2" Ruggedized Metal Meter Movement Meter Face in Both mR/hr and uSv/hr Gamma and X-Ray From 80-2000 KeV Within 20% Three Ranges 0-1000, 0-100, 0-10 mR/hr and 0-10,000, 0-1000, 0-100 uSv/hr 3lbs, 13ozs/1.73 kgs with batteries 4.4" W x 7.75" L x 6.25" H, including handle Halogen Quenched, Energy Compensated GM Tube, Effective Length and Diameter: 0.625" x 0.194" Saturation in excess of 1000R/hr when calibrated and maintained properly Individual Calibration Potentiometers for each range Operates on two "D" Cell batteries providing over 300 Hours of continuous use with Alkaline Batteries Regulated High and Low Voltages Drop Tested from one meter in excess of twenty five times with no damage or failures Options: Internal Click Style AUDIO ND-2000A, External Detector Probe  ND-2000P