The thing to realize with rangefinders is the question is absolutely not about accuracy... the question is yes/no; did you get a reading?
If you got a reading and the square/crosshair/dot was in the right spot the number will be impossibly correct. The problem is when the unit fails to get a reading. The better the unit the more times it will get a reading.
On more than one occasion I have had a number of different units going at once and they produce virtually exact numbers every time... until they fail to get a reading.
That's what I meant when using the term "reliable".
