Does anyone know how accurate the Zoom H2 chromatic tuner is? I checked my recently tuned Baldwin Acrosonic, and a number of the keys were off a bit according to the tuner. The tuner shows (via left and right dots) how much the key is off. Does anyone know approximately how much each dot represents?

Perhaps this topic was better posted in the Tuner Forum, but since I'm a beginner, I posted it here hoping to get a beginner's explanation.

BTW, I love the H2. Records very nicely.