AI-Tek Instruments (formerly Airpax Instruments) is the leading supplier of industrial speed sensors and tachometers.

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Tachometers can be blind (with analog and/or relay outputs), or they can have an integral digital display as well.

Speed sensors can be two-wire (passive) or three-wire (powered).

Guide to obsolete tachometers:

Tachpak 1 (T77130-xx) has been replaced by the Tachpak 10 (T77510-xx)

Tachpak 3 (T77430-xx) has been replaced by the Tachpak 30 (T77530-xx)

Tachtrol 3 (T77310-xx) has been replaced by the Tachtrol 30 (T77630-xx)