Agilent/HP / Universal Counter / 53131AFrequency Range A .1 Hz - 225 MHz Frequency Range B .1 Hz - 225 MHz
Frequency Resolution 10 Digits
Input Sensitivity 1 20 mVrms - 5 Vrms Input Sensitivity 2 HP-IB - 5 Vrms
Number of Channels 2
Other Features 20 mVrms - RS/232 Time Base Accuracy .3 ppm.