Agilent / HP / Keysight 5326A

This counter measures frequency to 50MHz, also measures period average, time interval, ratio, totalizing, and scaling.

Burst and CW measurements are also available.

One shot time interval measurements from 0.1µs to 108s and built in DVM for setting trigger levels with ease, Plus measuring external DC voltages.

It features an 8 digit display readout, and offers reliability and versatility along with HP quality.