Hewlett Packard
53181A

The Agilent 53181A 225 MHz RF Counter provides fast, precise results with the core measurements needed for RF tests.
It provides 10 digits/second resolution.

Features
* Measurements include frequency, frequency ratio (with optional channel 2), period and peak voltage
* Automated limit tests and one-button measurement setups for fast, easy operation
* 10 digits/second resolution
* Built-in statistics feature lets you simultaneously measure average, min/max, and standard deviation
* One 225 MHz input channel, plus optional second channel
GPIB standard

Please find a corresponding data sheet here.