Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: More false readings than true ones

I concur with Douglas E. Wong's review, and Baumgartner's comment to it. This is a very disappointing tool. I get readings all over the place, and have to use common sense to reject the bad ones -- of which there are many (the majority). Furniture and objects that you would expect to be out of the cone of measurement are in fact in it. I suppose if you only make readings in empty spaces, this might be a good value. Otherwise, save your money.As Wong noted, this is a sonic measurer. The red dot is "suggestive" of what you are measuring. It is EXTREMELY misleading because the actual cone of measurement is very wide (no matter what the specs say), and all sorts of nearer-by furniture will be measured instead.A different defect is that you have to press down the "Read" button hard to activate the device. The amount of pressure required is enough to make your hand & direction shift.What a pity, it had so much promise.