BKPRECISION 1823A Universal Frequency Counter with Ratio Function (2.4Ghz)

Range 0.1 Hz - 2.4 GHz
Frequency: yes
Totalize: yes
Period: yes
Time Base Stability: ±1ppm
Best Resolution: 1 nHz
No. of Digits: 9
Display Hold: yes
Low Pass Filter: yes
Sensitivity:
250 mV (0.1 Hz - 1 Hz),
30 mV (1 Hz - 100 MHz),
25 mV (80 MHz - 150 MHz),
20 mV (150 MHz - 2.0 GHz),
60 mV (2.0 GHz - 2.4 GHz)
Remote Interface: RS232
Self-Test: yes
Time Interval Measurement: yes
Frequency Ratio Measurement : yes
Input Power: 115/230 V (50/60 Hz)
Weight: 5.5 lbs (2.5 kg)
Dimensions: 239 x 89 x 269 mm

Datasheet

Manual