This is a kind of quality J305 G-M tube, tin oxide cathode, coaxial cylindrical thinshell structure (wall density of 50±10cg/cm2), pulse applied type halogen tube. Support provide the detection γ-Ray of 20mR/h-120mR/h and soft β-Ray in r-ange of 100-1800 decay/minutes·CM2. You can have a try.

Features:
Tin oxide cathode, coaxial cylindrical thinshell structure (wall density of 50±10cg/cm2), pulse applied type halogen tube.
Support provide the detection γ-Ray of 20mR/h-120mR/h and soft β-Ray in r-ange of 100-1800 decay/minutes·CM2.
The ambient medium temperature is from -40°C to 55°C.
Easy installation, it can be installed on the geiger counter without need tools.
Comes with one PVC tube for convenient transmission.
A perfect replacement accessory for IOT-G M-v1.1 IOT open-source geiger counter G-M tube.

Specifications:
Name: J305 Geiger Tube
Material: glass+metal
Working temperature: -40℃ to 55℃
Minimum plateau length: 80V
Max plateau slope rate: 10%/80V
limiting operating voltage: 550V
Max background count rate: 25 times/min
Lifespan: ＞1*109 pulse
Item size: 88 * 10 * 10mm / 3.47 * 0.39 * 0.39in
Item weight: 18g / 0.63ounce
Package size: 145 * 90 * 110mm / 5.71 * 3.54 * 4.33in
Package weight: 55g / 1.94ounce

Packing List:
1 * J305 Geiger Tube