Distance meter Unit LM120A — 40 m range, 1 mm accuracy

The UNI-T LM120A Laser Distance Meter is a compact measuring tool designed for accurate distance, area and volume measurements up to 120 m. It provides millimeter-level resolution with a 2.0-inch LCD, supports metric and imperial units, and stores up to 99 groups of data. The device includes a physical bubble level for improved alignment, automatic calibration, CE and UKCA certification, and an ergonomic housing for comfortable handling. The package contains the distance meter, a carrying bag and an instruction manual.

Advantages

The LM120A combines high accuracy (±(2 mm + 5 × 10-⁵ D)) with a wide function set, including single and continuous measurements, maximum/minimum capture, area and volume calculation, Pythagoras (indirect) measurement, and addition/subtraction of results. Real-time display updates and instant data conversion accelerate measurement workflows. Built-in automatic shutdown of the unit and laser helps conserve battery power, while the physical level and automatic calibration aid precise alignment and repeatable results.

Key specifications

• Manufacturer: UNI-T
• Model: LM120A
• Measurement range: 120 m
• Smallest display unit: 0.001 m
• Accuracy: ±(2 mm + 5 × 10-⁵ D)
• Display: 2.0-inch LCD
• Measuring units: m / ft / in
• Measurement base: Front / back of the device
• Laser class/type: Class 2; 630–670 nm, <1 mW
• Supported measurements: single, continuous, max/min, area, volume, Pythagoras (indirect)
• Addition/subtraction of values: Supported
• Memory: up to 99 groups of data
• Automatic shutdown: device after 3 min, laser after 30 s
• Operating temperature: 0 °C to 40 °C
• Storage temperature: -20 °C to 60 °C
• Power supply: 2 × 1.5 V batteries (LR03)
• Product color: Red, gray
• Dimensions: 122 × 52 × 29.5 mm

How to use

Position the LM120A on the chosen measurement base (front or back), switch the unit on and select the required measuring mode. Aim the laser at the target and perform a single measurement or use continuous mode for dynamic distance readouts. Use the area and volume functions to calculate surfaces and volumes from sequential distance measurements, or use the Pythagoras function for indirect height or distance calculations. Store results in memory as needed and use the addition/subtraction features to combine values directly on the device.

Recommendations

For best accuracy, ensure the device is aligned using the built-in bubble level and avoid bright reflective surfaces that can affect the laser. Replace batteries in pairs and store the meter within the specified temperature range. Use the carrying bag supplied to protect the instrument during transport and keep the instruction manual for reference to safety and calibration procedures.