
I like this concept but mine doesn't work properly, they sent me a new one. on the right side 3 batteries have already settled and the light is very weak. not even widespread, will be updated as soon as a new one appears. I hate getting things that don't work, coming back from Hawaii is a pain you know what. I would understand if it was a cheap toy, but it's not exactly cheap. Well I got a second one and unfortunately it absolutely does NOT work better, it really is a waste of money. I can only use it once before I have to change the batteries again. My honest opinion: DO NOT buy, I wanted this to work so bad, I'm very picky about bumps. But the good old ruler works better than this expensive junk. If I could give zero stars it would be more accurate.

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