Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Very Limited Use, Not Worth the Money

As a window washer, I purchased this to measure building heights for estimating what ladder we would need for larger jobs. This device is worthless for that. It barely works outdoors and only about 3 out of every 10 readings are accurate. It has to be exactly perpendicular to the object being measured and nothing can be in the way of the sonic path or you error reading every time. I didn't realize that this was NOT a laser unit but a sonic unit with a laser pointer on it. Big difference! Save the $30 and put it toward a true laser measurement device.