Quick Answer: The Tapping Key is a spring-loaded momentary switch with polished brass hardware on an insulated base. It has two 4mm binding posts and an insulated finger knob.
Last updated: October 2026
Key Features
Spring-loaded lever that breaks the circuit when released
Insulated finger knob
Polished brass hardware
Two 4mm binding posts
Insulated base
Technical Specifications
Specification
Value
Action
Spring-loaded lever, momentary contact
Hardware
Polished brass
Terminals
Two 4mm binding posts
Base
Insulated
About This Product
A tapping key closes a circuit only while it is pressed, so current flows for just as long as a reading is needed. It is used with galvanometers, in metre bridge and potentiometer balancing, and in electromagnetic induction experiments. Educational Instrument can dispatch the Tapping Key to laboratories in Antigua and Barbuda, Tajikistan, Liberia, Mauritius, Zimbabwe and Papua New Guinea.
Frequently Asked Questions
Does the Tapping Key stay closed when released?
No. The lever is spring-loaded, so the circuit opens as soon as the knob is released.
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