Pen Frequency Counter with Voltage and PWM Functions

Check a project signal and try a pulse source from the same compact instrument. This pen-style counter combines frequency measurement, PWM generation and low-voltage DC measurement for electronics work.

✅ Compare a signal with the frequency your project expects - The counter displays the measured frequency within its stated range.

✅ Try a different test pulse without a separate generator - The built-in output offers adjustable frequency and PWM duty cycle.

✅ Check a low-voltage supply without reaching for another meter - The 0-5V DC function provides a power-rail reading in the same instrument.

Bring Measurement and a Test Signal to the Bench

For an oscillator or logic project, frequency tells you how often a signal repeats; it does not show the complete waveform. Use the counter when that frequency reading answers the question you are investigating.

The pulse-output function provides a separate role: supplying a configured test signal. Match signal levels, connections and grounding to the circuit before use, following the instrument's limits rather than treating every connection as interchangeable.

Technical details

• Frequency measurement: 5Hz-100MHz
• Signal output: 1Hz-4MHz; adjustable PWM duty cycle
• DC measurement: 0-5V
• USB-C 5V power; pen-style display
• For low-voltage electronics; never connect to mains

Add a compact counter and pulse source to your electronics toolkit.