Specification: Color: multicolor Material: metal Geiger tube parameters: Technical parameters diameter:Φ10±0.5mm Total length: 90±2mm Starting voltage: 1 x 10^9 pulse Medium temperature: -40 ~ 55 ℃ Package size: 19 * 13 * 7cm Package weight: 200g Packing List: 1 * Assembled Radiation Detector System 1 * GM Tube 1 * Power Supply Cable 1 * Battery Holder (without batteries) 3 * Jumper Wires 4 * Nuts 1 * Acrylic Cover