Aim-TTi TF930 Frequency Counter, 0.001 Hz Min, 3GHz Max, 10 Digit Resolution - With RS Calibration

Frequency, period, pulse width, frequency ratio duty cycle, and event counter modes
DC to 3000MHz range, 0.001mHz resolution
High impedance measurement up to 125 MHz
AC or DC coupling, 1M/50Ohm selection, polarity invert
Switchable attenuator, threshold control
Noise filter for low frequency measurements
Selectable measurement time; display hold function
Large 9 digit display with full range of annunciators
Internal rechargeable batteries for portable use
USB interface provides full remote control and readback