The Keysight 53230A universal frequency counter/timer serves all your frequency and time interval measurement needs. In addition to the typical frequency and time interval measurements, continuous/gap-free measurements are available for basic modulation domain analysis.
Two 350 MHz input channels, plus optional third channel (6 GHz or 15 GHz)
12 digits/second resolution, 20 psec time interval resolution
Built-in math analysis and colour, graphical display (trend and histogram)
Continuous, gap-free measurements and timestamps for basic modulation domain analysis