Charging Voltage Dosimeters are capable of being charged to “zero” with 140 to 195 volts. Operational Characteristics A maximum change in sensitivity of ±10% may occur under any probable combination of the following: A) Temperature range below -20°C (-4°F) or above +50°C (122°F) B) Greater than 50,000 foot altitude for one month C) Relative humidity greater than 95% Highly resistant to shock and vibration. Accuracy ±10% of true dose for Cs137 or Co60 gamma. Rate Response Dosimeters are dose rate independent. Enclosure Material Barrel - carbon fiber-filled, high-strength, electrically-conducting plastic with metal clip. Weight Approx. 19 grams (0.7 oz.) Size PEN- 200, 500, 2mSv, 5mSv Length: 11 cm (4.5 inches) Diameter: 1.5 cm (0.6 inches) PEN- 2, 5, 20 Length: 11.5 cm (4.5 inches) Diameter: 1.5 cm (0.6 inches) Options Protective sapphire lens Limited Warranty 2 year limited warranty.