Used, HP Universal Counter 100mHZ

Agilent HP 5315A - Universal Counter DC to 100 MHz with Optional TCXO Timebase The 5315A is a low-cost portable bench version of the 5316B high-performance universal counter. Unique counting circuitry gives the best of both reciprocal and conventional frequency counting. Full frequency range (to 100 MHz) on both input channels provides frequency, period, ratio A/B, and totalize A by B measurements.