High-Precision Digital Tachometer with Optional LED Display (Blue / Green / Red) – Motor Speed & Frequency Measurement

This compact and high-performance digital tachometer is designed to deliver accurate measurements of motor speed (RPM) and frequency. With its optional LED display colors (blue, green, or red) and user-friendly controls, it is ideal for motor testing, DIY projects, and lab applications.

Features

• Compact size with fast response time for precise measurement.

• Clear 0.56″ LED 4-digit display (available in Blue / Green / Red).

• Wide measurement ranges:

  • Speed: 5–9999 RPM

  • Frequency: 0–98990.1 Hz

• Retains parameters even after power-off.

• Easy-to-use settings for switching between RPM and frequency modes.

• Auto-save function after 10 seconds of inactivity.

• Decimal point display for speeds under 1000 RPM.

Specifications

• LED Display: 0.56″, 4 digits

• Display Colors: Blue / Green / Red (Optional)

• Rotate Speed Range: 5–9999 RPM

• Frequency Range: 0–98990.1 Hz

• Rate Setting Range: 1–99 (Default: 01)

• Reset Time: 10s

• Refresh Rate:

  • 120–1200 RPM: 0.2–0.5s

  • 2400–9999 RPM: 0.25–0.6s

• Accuracy:

  • <5000 RPM: ±2 RPM

  • 5000 RPM: ±3 RPM

• Input Signal: Voltage pulse, active contact signal, PNP, NPN

• Power Supply: DC 8–15V

• Installation: Embedded

• Dimensions: 72 × 36 × 20mm / 2.83 × 1.42 × 0.8in

• Weight: 25g / 0.88oz

Important Notes

• Sensor is not included.

• Not suitable for directly measuring car engine RPM without proper sensors.

Package Includes

• 1 × Digital Tachometer

Additional Note on Display Behavior
Please note that the LED display is a 7-segment type, which means only the necessary segments will light up to form the numbers being measured. Not all display segments are lit at the same time. For example:

• At low RPMs (e.g., below 1000 RPM), only 1–3 digits may be active depending on the actual value.

• At higher RPMs (e.g., several thousand), more digits and segments will light up.
  This is normal behavior for digital tachometers and does not indicate a defect. The product pictures are for illustration of the display style only.

Simplified Setup Instructions

1. Power On: Connect DC 8–15V to the tachometer (+12V to positive, GDN to negative).

2. Signal Input: Connect the motor’s pulse output (PNP/NPN or voltage pulse) to IN+.

3. Mode Switch:

   • Press SET once → “1” shows → RPM mode.

   • Press ADD to switch → “2” shows → Frequency mode.

4. Rate Setting: Press SET until “01” is displayed. This is the default rate (display equals actual RPM). If set to “10,” the displayed value ×10 = actual RPM.

5. Auto-Save: After 10 seconds without pressing a button, settings will automatically save.

6. Reading Display:

   • Below 1000 RPM → one decimal point shown (e.g., 856.3).

   • Above 1000 RPM → whole numbers only (e.g., 2450).