Model	Min. Freq.	Max. Freq.	Freq. Resolution [Digits]	Measurements
PM 6681	10 Hz	300.0 MHz	11	Time interval, Pulse width, Rise/Fall Time, Frequency, Burst Frequency, Period, Ratio f1/f2, Phase, Duty factor, Totalization
PM 6685R	?	300.0 MHz	10	Frequency
PM 6685	?	300.0 MHz	11	Frequency, Burst Frequency, Period, Ratio A/E C/A, Pulse width, Duty factor, Totalize A
164	50 MHz	160.0 MHz	10	Frequency, Burst Frequency, Frequency ratio, Period, Pulse width, Rise/Fall Time, Time interval, Phase, Duty cycle, Vdc, True RMS Vac+Vdc, Vmax, Vmin, Vp-p, Jitter, Totalize Counts and RPM.
PM 6681R	?	300.0 MHz	11	Time interval, Frequency, Phase, Jitter
PM 6680B	10 Hz	225.0 MHz	10	Time interval, Pulse width, Rise/Fall Time, Frequency, Burst Frequency, Period, Ratio f1/f2, Phase, Duty factor, Totalization
PM 6669	100 mHz	160.0 MHz	9	Frequency, Period, Count totalization, Pulse width, Frequency difference, RPM
PM 6666	100 mHz	160.0 MHz	7	Frequency, Period, Ratio, Totalization, Time interval, Volt max/min
164T	50 MHz	2.7 GHz	10	Frequency, Burst Frequency, Frequency ratio, Period, Pulse width, Rise/Fall Time, Time interval, Phase, Duty cycle, Vdc, True RMS Vac+Vdc, Vmax, Vmin, Vp-p, Jitter, Totalize Counts and RPM.
164H	50 MHz	2.7 GHz	10	Frequency, Burst Frequency, Frequency ratio, Period, Pulse width, Rise/Fall Time, Time interval, Phase, Duty cycle, Vdc, True RMS Vac+Vdc, Vmax, Vmin, Vp-p, Jitter, Totalize Counts and RPM.