
I bought this unit with a defect, returned it and bought a second unit which was also defective. Unfortunately, it fails to do its primary job of keeping the plane level, even after it's calibrated and properly installed. These devices have a slow drift with a constant bank angle. You can zero the bank angle and flatten it out, but it just starts drifting again. Both blocks had the same problem. The seller states that this should not be used as the primary tool...obviously it will fail if you rely on it. Problem. Also, you will find that the seller/maker no longer supports this device. I wanted it to work so badly.

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