First off make sure you have brand new batteries. I tried 2 that were a little used and the unit would not function. I installed a new battery and unit functioned properly. I have noticed the readings will vary as much as 5yds so I needed to take the measurement 3 or more time to get a consistent reading. Overall for the price the unit functions well.
I use this range finder for work. I do field engineering work and have to get distances between telephone poles. I only use it in places I cant walk to with a wheel tape. It is accurate (yards or meters only) and is easy to read. The one thing I was disappointed about was once I got it, some of the rubber abound the grips wasn't perfectly in its place. But...I paid $103 for an 800 yd range finder when I could have paid twice that for a 200 yd range finder. Its good for what I use it for. Ive used it out to 225 yds and then measured it to verify the accuracy. Its always within 3 ft of being correct. This is because if it reads that the distance is 101 ft, it will display 34 yds. (33 yds x 3 = 99ft.) (34 yds x 3=102 ft). Would highly recommend this for the value.
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