Specifications: Detector: Type - GM tube with thin mica window. Effective Diameter: 1.75 inches (45 mm). Window Thickness: 1.4-2.0 mg/cm2 Detectable Radiation: Alpha, beta, gamma, and x-rays Efficiencies: Gamma - 3600 CPM/mR/hr; beta - C-14 10%, S-90/Y-90 35% Temperature Range: -25°C to 50°C (-13°F to 122°F) Humidity Range: 0 - 90% Relative Humidity Operating Voltage: 850 - 1000 volts - 900 volts optimum Probe construction: Anodized aluminum housing. Size - Approx. length: 22.2 cm (8.75 in.) Dia.: 7.0 cm (2.75 in.). Connector - To match either Victoreen or Lionel CDV-700 meters. Handle - adjustable Black vinyl grip. Weight: Approx. 328 grams (11.5 oz.) without cable. Includes: One year limited warranty and protective cap for the detector.