• e/m apparatus is designed for the measurement of the charge to mass ratio e/m, of the electron.
• Equipment also facilitates the demonstration of electric field and magnetic field effects on moving charged particle. 

Apparatus is designed to work on mains, High voltage power supply built-in with one Digital Voltmeter is provided to measure the deflection voltage. Power supply unit provided with separate focus  control , intensity control , X-shift   and  deflection controls knobs ,Complete unit includes fine electron beam tube (Cathode Ray tube) fitted on  graduated wooden frame with scale divided in centimeters, deflecting magnetometer with permanent magnetic compass included. Compass stand, a pair of bar magnet. Complete in all respects.To determine the specific charge e/m of an electron using Thompson Method