If you make the fulcrum in the center of the lever then what the scale reads is the weight of the hive. (Assumption) the assumption is that the weight is equal on each side which it probably isn't. So if you want a more accurate reading then do both sides and divide each reading in 1/2 and add them together. It doesn't matter how high the hives are you will just need a spacer maybe 2X4 stick cut to the right height to reach the hive. Watch the scale. It will continue to rise until the hive lifts off what is supporting it then it will go no higher. Try it it is easy to do.