Review on Digital Level Protractor Inclinometer Magnetic - Ultimate Angle Measurement Tool for Carpentry Test, Measure & Inspect by Jeff Rubio

I have tested this on some high levels I have and it has an acceptable reading. Very accurate. This is not mechanical accuracy, but approximate. The display backlight turns off after 20-30 seconds if I don't move or touch the device, it could stay on a bit longer but that would be my only complaint if I had one. But I can handle it, just wanted to mention it. While the device is in hold mode, you can scroll through the different measurement modes to retrieve their readings, making it easier to switch between measurements. This device is used with internal magnets on a 4 foot cast iron level for underground applications. Plumbing, so I think it's more than accurate enough for that.