Tube holder to support all S series (student) electron tubes for easy and safe operation. The five pin sockets for the tube are concealed inside the tube holder. A cathode protection switch is integrated into the tube holder, to protect the heated cathode from excessive voltage.
HOOKUPZ* 2.0, Universal Smart Phone Optics Digiscoping Adapter, Optics with an eyepiece of 25-58mm, For Binoculars, Spotting Scopes, Monoculars, Telescopes, Microscopes, Incompatible for riflescopes and tablets, Fits ipods, iphones, Galaxy, Motorola and HTC phones
Teltron Critical Potentials Tube S with He-Filling for quantitative investigations of inelastic collisions of electrons with inert gas atoms. Cathode filament voltage: UF </= 7V; Anode voltage: UA </= 60V; Anode current: IA </= 10 mA