Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Perfect for anyone's tool box

I bought this item because Strait-Line was one of the few laser levelers that didn't use pins/nails to secure itself to the wall. It uses the 3M self-adhesive pads. Each pad is good for one use, and I think it came with 4 pads in the box. I bought additional 3M pads at a large chain store in the mall (I won't mention names). Yes, buying additional pads will cost money, but it doesn't poke holes in your walls like the other products will.The unit has 3 bubble leveling vials, one for each axis. Initially I only saw two of them, and when I fastened the unit to the wall, it was perfectly level on the first wall, but titled on the second wall. I then found the 3rd vial, and learned that the whole unit will tilt to get the line on the second wall level with the first; I was impressed.It requires 2 AA batteries, which are not included.