Laser Rangefinder for Measuring Distances

• Type: laser rangefinder
• Measuring range: 40 m
• Measuring accuracy: ±2 mm
• Units of measurement: metres, inches, feet
• Laser safety class: 2 (II)
• Laser radiation wavelength: 620–690 nm
• Laser radiation power: below 1 mW
• Display: liquid crystal (LCD)
• Result memory: 99 values, recallable to the display
• Power supply: 2 AA cells, 1.5 V (not included in the delivery set)
• Overall dimensions: 110 × 48 × 25 mm
• Housing: durable plastic

Product passport: ULABS-G008 (PDF)

Use

• The distance is determined by a laser beam directed at the target and by the signal reflected from it, so one person performs the measurement without a partner and without stretching a tape.
• Preparation: install two AA 1.5 V cells observing the polarity, switch the unit on and select the units of measurement before starting a series of measurements, not in the middle of it. Room dimensions are measured in metres.
• Establish the reference surface: measure a known distance and compare the readings, then always place the instrument against the reference point with the same surface — otherwise the 110 mm length of the housing is added to or subtracted from every result.
• Direct the beam perpendicular to the target and hold the instrument still with both hands or place it on a firm support. With an oblique aim the device shows the distance along the beam, which is always greater than the distance between the planes.
• Repeat each measurement two or three times: a spread within the ±2 mm accuracy of the instrument means the measurement was made correctly.
• A matte light surface reflects the beam best; on dark, glossy, transparent and mesh surfaces the signal is weak, and a sheet of white paper or card is placed at the target instead.
• Room dimensions are measured in sequence: length from wall to wall at about one metre above the floor, width from the same point, height with the instrument standing on the floor and the beam directed at the ceiling. Keep furniture, cabinets and people out of the beam path.
• The memory holds 99 measured values and recalls them to the display. It is a sequence of numbers without explanations, so keep a measurement log in parallel and clear the memory before a new series.
• Dusty air, bright sunlight on the target and discharged cells reduce the working range; a device brought in from the cold is left to stand until the condensation is gone.

Laser safety

• Intended for general secondary education, for learners aged 10 and over (grade 5 and above), under the supervision of a teacher.
• Do not look into the laser beam and do not direct it at people or animals even for a moment: the beam of a class 2 laser is hazardous to the eyes.
• Do not direct the beam at mirrors, glass, polished metals or other shiny surfaces — the reflected beam changes direction unpredictably.
• Do not examine the laser spot through a magnifier, binoculars, a microscope eyepiece or any other optical instrument: the optics concentrate the radiation.
• Before first use, check the laser class, wavelength and power against the marking on the housing and follow the manufacturer's warning label.
• Switch the beam on only at the moment of aiming at the target; do not keep the measurement button pressed unnecessarily.
• Do not disassemble the housing and do not attempt to adjust the optical unit: with a damaged housing the radiation leaves in an unpredictable direction and work with the device is prohibited.

Battery safety

• Use only cells of the type and rating stated in the documentation or on the housing; do not mix new and partly discharged cells.
• Observe the polarity when installing the cells; if electrolyte leakage appears, remove them immediately without touching the contents by hand.
• Remove the cells if the device will not be used for more than a month.
• Do not recharge cells that are not intended for recharging and do not throw them into fire.

Maintenance and storage

• Clean the emitter and receiver windows with a soft dry optical wipe, slightly moistened if needed. Solvents, alcohol and abrasives are not used. Wipe the housing and display with a soft damp cloth.
• Protect the device from drops and impacts: an impact shifts the mutual position of the emitter and the receiver, after which the device gives a systematic error noticeably larger than ±2 mm. After every drop the accuracy is checked against a known distance.
• Replace both cells at the same time and remove them before a long break in work.
• Store in a dry heated room, in a case or box, away from heavy objects; do not leave the device in the sun, on a windowsill or in a car.
• Storage conditions: temperature +5 °C to +40 °C, relative humidity 60 %.

Compliance

• Complies with the applicable European Union directives and regulations and bears the corresponding CE and WEEE markings. Remove the cells before disposal and hand the device over to a separate collection point for waste electrical and electronic equipment.