Frequency Meters / Tachometers without limits

136
Measuring range in Hz.
Power supply: Battery
Number of digits: 8
522
Measuring range 1/sec or 1/min HRA measurement.
Power supply: DC
Number of digits: 6
524
Multifunction (Pulse, Frequency, Time).

Power supply: DC
Number of digits: 6
52U
Universal with Dual functions in 4 combinations.
Power supply: DC
Number of digits: 6
52P
6 Count modes with Tachometer.

Power supply: DC
Number of digits: 6
542
Measuring range 1/sec or 1/min HRA measurement.
Power supply: AC+DC
Number of digits: 6
544
Multifunction (Pulse. Frequency, Time).

Power supply: AC+DC
Number of digits: 6
54U
Universal with Dual functions in 4 combinations.

Power supply: AC+DC
Number of digits: 6
54P
6 Count modes + Tachometer.
Power supply: AC+DC
Number of digits: 6