Detailed Description

This is out most sensitive Beta Gamma Geiger Tube for its size 3.33" x 0.42" dia. The J304BY operates from 360 to 440V. Anode resistor 5 Megohm and 25CPM background. Screws into a miniature E10 lamp socket (included). Note: these are barnd new fully tested - the glass is very thin and fragile. Dropping the tube, squeezing the glass or twisting it too great into the socket WILL BREAK the glass causing permanent damage to the tube. Sorry, we can not replace broken tubes. Works 100% with our C8600ASB Geiger Counter (not included) and Grab a Backup if you have our CJ304 Geiger Counter w/ Beautiful Firework Fountain Display.