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Link: http://HarborFreightReviews.com

Item: Dial Gauge Angle Finder
Item number: 34214
Retail price: $4.99
Frequent sale price: $3.99
Target price: $2.99 (with coupon)
Item Link
OK, so you're wondering what this might be useful for? Me too. Not being a serious project builder (I try to avoid projects that need angles.), this appears to be an interesting but useless toy. Not so fast. I also own a motor home (MoHo) and one thing MoHo owners all appreciate is the necessity of keeping our rigs (or specifically, our refrigerators) level or at least within the plus/minus 5 degrees necessary to prevent damage to our refrigerators when parked.
I have two of these, mounted 90 degrees apart, that provide precise information on the degree of tilt I have when parking my MoHo. Much better (and cheaper) than comparable devices sold at MoHo suppliers, these little devices add a tough of class to my rig. And if I ever get ambitious enough to try a project requiring angles, well, they double for their manufacture’s intended purpose too.
BTW: I bet the welders out there who can slap this on to a piece of iron held tightly by its magnetic base can find some serious use for this tool.
Bottom line: A must have item for those who own a MoHo and probably of use to others who build projects on a slant.