The UNI-T UT373 is a compact handheld laser digital tachometer designed for non-contact rotational speed testing of motors, fans, spindles, conveyor rollers and automotive rotating components. It adopts laser photoelectric sampling technology with reflective tape for stable RPM reading, supporting dual measurement modes: rotational speed (RPM) and revolution counter. Featuring mini lightweight body, high precision and complete practical functions, it is widely used in machinery maintenance, auto repair, electronics production and industrial equipment inspection. It complies with CE and UKCA safety standards.

• Rotation speed (RPM): 10.0 ~ 99999 RPM
  • 10.0 ~ 9999.9 RPM: Resolution 0.1 RPM
  • 10000 ~ 99999 RPM: Resolution 1 RPM
  • Accuracy: ±(0.04% reading + 2 digits)
• Revolution counting: 0 ~ 99999 counts, accuracy ±1 count
• Measuring distance: 50 mm ~ 200 mm
• Allowable measuring angle: Within ±30° perpendicular to target surface
• Refresh rate: 1 second (≥120 RPM); up to 7 seconds at ultra-low speed

• Display: 5-digit LCD with backlight, max display value 99999; overload prompt "OL"
• Dimension: 183.8 * 56 * 34 mm
• Net weight: 85 g (without batteries)
• Power supply: 3 * AAA 1.5V batteries
• Drop resistance: Pass 1m free drop test
• Operating environment: 0℃ ~ 50℃, RH ≤80% non-condensing
• Storage temperature: -20℃ ~ +60℃

1. Safe Non-contact Laser Measurement, No Wear to Workpieces
   Class 2 laser sensor detects rotation without touching rotating parts, eliminating abrasion risk on high-speed shafts, fragile blades and precision spindles. Equipped with laser-on indicator to remind users of laser emission status.
2. Dual Measurement Modes: RPM & Revolution Count
   Switch freely between real-time rotational speed and total revolution accumulation via MODE button. Count function supports one-key zero reset for batch production counting and equipment runtime statistics.
3. Complete Data Recording Functions

• Data Hold: Freeze measured value on screen for easy recording
• MAX/MIN storage: Automatically capture peak and minimum speed during testing, convenient for troubleshooting unstable rotation speed
• Overload "OL" prompt for over-range rotation signals

4. Backlit LCD for All-light Scenarios
   Adjustable LCD backlight enables clear reading in dim machinery rooms, night maintenance and dark production workshops; long press HOLD key to turn backlight on/off.
5. Energy-saving Intelligent Power Management
   Auto power-off function after idle operation; low battery icon warning reminds users to replace batteries, effectively extending service life of AAA batteries.
6. Mini Ergonomic Handheld Design & Rugged Structure
   Ultra-light compact body with anti-slip side texture for comfortable long-time holding. Passes 1m drop test to resist accidental impact during field patrol inspection.
7. Standard Matching Accessories & Easy Operation
   Comes with reflective tape for attaching to rotating surfaces; simple 4-key layout with clear operation logic, no complex training required for maintenance staff.

1. Wide measuring range covering low-speed equipment (10 RPM) and high-speed spindles (99999 RPM), one unit fits multiple testing scenarios.
2. High-precision measurement with tiny resolution, ideal for precision equipment calibration and quality inspection.
3. Portable lightweight design, easy to carry in tool bags for on-site mobile maintenance.
4. Cost-effective industrial-grade tachometer with full certifications, stable performance for long-term daily use.
5. Simple laser alignment requirement with wide 50–200mm working distance, flexible for hard-to-reach rotating parts.

Motor & fan speed inspection, CNC spindle rotational test, automotive engine/transmission maintenance, conveyor roller speed monitoring, drone & small motor testing, generator and pump equipment troubleshooting, production line rotational part counting, household appliance motor inspection.