The high-frequency coil can be used to test vacuum equipment for leakage or excite electrical tubes for demonstrations.

• Coil tests vacuum equipment for leakage or excites electrical tubes for demonstrations
• Instructions included
• Connecting cord and attachment plug included
• Coil is mounted in Bakelite case
• Small enough to hold in one hand

It's mounted in a hard Bakelite case small enough to hold in one hand. One terminal is attached to the pointed end of the coil. A screw at the large end is adjustable.

The voltage is 40 to 50 kV, and the spark frequency is three to four MHz. A featured knob adjusts the spark length. After 10 minutes of continuous use, the coil must be turned off to cool.