I was hoping to use this for my 2% (and sometimes 1%) drain slope. I found the device unreliable because I believed that the device then recognized an actual grade of four to seven percent (increase over mileage). Its bulky, clunky plastic ends are easy to reach. I made my own, I took a cheap 2 foot plastic scale and screwed in a 1/2" sheet metal screw for my 2% pitch; enough.
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