Accurate Measurement: Class II infrared rangefinder with MAX OUTPUT<1mW, λ=620-690nm, measurement accuracy ±2mm. Upgraded dual-tube structure reduces temperature error; dual bubble levels ensure horizontal direction for precise results. Multi Function: Supports area, distance, volume measurement, continuous measurement, Pythagorean methods, and addition/subtraction mode. Continuous measurement records max/min values as needed. Wide Application: Completes most measurements in 0.5 seconds, ideal for house, room, backyard or construction site measurements. Suitable for carpenters, realtors, landscapers, painters as a quick alternative to electronic tape measures. Portable & Durable: Weighs 3 ounces, fits in toolbox or pocket. Made of ABS material with IP54 protection against water splashes. Simple interface and sturdy circuitry. Specification: Material: ABS; Measuring range: 40/60/80/100M (optional); Measurement accuracy: ±2mm; Temperature range: -20-40℃; Max storage: 20 groups; Battery type: 2*7 batteries (not included). Color: As shown in the picture. Packing list: 1 x Rangefinder, 1 x Lanyard, 1 x Manual