This Geiger Counter is powered by 3x ‘AA’ cells and uses a remote GM tube in a holder connecting by standard BNC plug. ‘ Lo Batt’ warning is provided. The large sensitive tube is of the ‘thin mica window’ type and detects Gamma, Beta and high energy Alpha particles. The instrument is light, very robust and is useful for both field work and the classroom. Other models are available with inbuilt tube. Tube voltage can easily be adjusted up to 600V. Counts can be selected to be continuous, counts over preset times, or Rate displayed as counts/Second. Socket provided for standard 240/12V.AC. Plug Pak to run the unit if cells flatten.