The tube has a clear separation between the two electrodes and an orange glow indicates negative polarity.
A large neon-filled gas discharge tube for demonstrating electric charge and polarity.
Diameter : 13 mm
Ignition voltage: 90 V
Length : 100 mm

Physics School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Neon Discharge Tube for Electrostatics Electrostatic Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities