Features: 1. A New generation of phase optic 2. Swi ST speed computing chip 3. Millimeter-level accuracy 4. Japanese ROHM Safety Laser 5. Non-spherical anti-interference len 6.lP54 Dust-proof and waterproof 7.30 Group of data storage 8. Physical double-horizontal bubble Specification: Model: SW-TG50 Measuring distance: 0.05m~50m Measurement accuracy: (1.5mm + d * 2 / 100 k) * Laser grade: Level 2 Type of laser: level 2,635nm, <1mW Number of stored records: 30 pen Auto cut off laser: 20 second Automatic shutdown: 150 second Full power working time: 8,000 time Storage temperature range: -20 ~60 Operating temperature range: 0 ~40 Range of storage humidity: 20% to 80% R H Battery capacity: 1.5V 2xAAA(shipped without battery) Battery charges: not rechargeable Angle measurement: physical horizontal bubble Overall dimension: 112 * 50 * 25mm Package includes: SW-TG50 host * 1 + instruction manual * 1 + storage bag * 1 Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.