I have There are two such Devices. 180 and 180pro. I've been using it since 2012/2013. The devices were used to remodel a house, set up a milling machine, and precisely sight a gun rest to line up the front rest. Both devices fell to the ground, disappeared into attics for weeks, lay in shooting bags and were not used for months. They have always been calibrated and provide good and reproducible angle measurements. The Pro has a Full Zero feature that allows you to set precise incremental hardware angles from a selected zero point and adjust the hardware to your preferred angle. I would give 5 stars but for two things. The magnets are not strong enough and the spirit levels are unusable. Both horizontal and vertical curtains cannot be set to the calibrated zero point, so curtains are a useless feature. I hate wasting money on useless things, but the digital side of this device works well enough.
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