Hello dear friend, welcome to Deli Tool Store. This is a mini 30 meter precision rangefinder. It is easy to carry and measures accurately. I am a good partner in your work. This one cannot measure angles. If you need to measure the angle, please contact customer service. thank you Change your perception of rangefinder, mini laser rangefinder 5 major black technology features: 1. Miniature and convenient 2. Zero meter measurability 3. Long range 4. Wide working temperature 5. Powerful measurement capability High precision integrated molding proce with rounded curves, comfortable grip, sweat and corrosion resistance USB universal interface, 250 mA 5V-1A Fully charge once and work continuously for 5 hours, Aspheric lenses, wavelet rate algorithms enhance small signal proceing capabilities. High transmittance LD receiving lenses. Reasonable layout of buttons makes testing easier High definition backlit LCD screen for clearer display Measurement accuracy, millimeter level accuracy, data accuracy to 0.001m Dear friends, thanks for shopping in BUQU store! sincerely hope , can be happy and satisfied from the moment you open the parcel.if you are not satisfied with the product received, I hope you do not give us bad reviews at will. please contact us, we will definitely give you a satisfactory solution! thank you vety much-thank you be happy!!