M4011/J321 Glass Geiger Muller Tube Alpha /Beta Particles Gamma/X-rays Detection Geiger Counter Tube High Sensitivity Geiger Counter Kit Tube for Ionization Nuclear Radiation Detection. Feature: Comprehensive Radiation Detection, High-Sensitivity Geiger Counter Tube, Versatile GM Tube Applications, Complete Geiger Counter Kit, User-Friendly Geiger Kit. Specification: Origin: Mainland China, Product size: 90.00x10.00x10.00mm, Product size: 3.54x0.39x0.39inch