Eisco PH0742A - Resonance Tuning Forks With Hammer

Nickel - A corrosion resistant conductive metal

Frequency - A term used to describe how often something is done

Frequency - A wave frequency is the number of times a wave repeats within a given time

Hammer - A tool used for providing impact to an object such as a nail

Adjustable - Something that can be changed or slightly modified to fit.

Adjustable - Something that can be changed in order to fit better.

Individual - A single separate item or person.

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