Product review (3 stars): Good, but difficult to use.
Complicated!  Reading the screen and programing requires a BA in engineering.  Don't accidentally hit one of the buttons on the bottom or you'll have to pull the batteries and start all over.

One of the few inexpensive instruments of its kind, and just from playing with it, seems to be working.  I wish there was a simpler model maybe with easy to read instructions and a few less features.