Review on 🎯 Phonograph Furniture with Circular Bullseye Measuring by Glen Needham

When I opened the box with two spirit levels, I was almost certain that they would not meet my needs. The first sign was the huge difference in size between the "bubbles" in the levels compared to each other. One has a small, reasonably sized vesicle that fits the central bullseye, while the other has a vesicle about 2 times larger in diameter and does not fit the central bullseye. Also, both tiers had some form of plastic contamination on the bottom "flat" edge, causing the level gauge to deviate a bit, too much for my intended use. A circular spirit level like this should give the exact same reading regardless of rotation when placed on a reasonably flat surface. None of them gave the same readings when placed on a known flat surface and rotated in 90-degree increments. Realizing that the readings change with rotation, I looked at the underside of them and both had dirt associated with the flat surface causing them to not stand level and therefore not giving the same reading , when rotated. Also, they have a raised edge on the bottom surface which should be flat while most of the bottom surface is underneath and not part of the base surface. This doesn't work for my intended application where I need to refer to the center of the floor plane, an area that doesn't seem to be controlled in terms of flatness. I need to measure the level of a quarter size object, so the edge reference surface is not suitable for my application. For each level there is a series of 5 photos. The first four in each set show the change in readings when rotated 90 degrees on a flat surface. An ideal plane does not change when rotated. The fifth photo shows a contamination that distorts the reference (lower) surface. This contamination can cause readings to fluctuate, as readings fluctuate slightly and do not level out on their own. These levels are probably accurate enough for checking the level of a trailer or RV or similar tasks, but they lack accuracy. I need it for my application and I also don't have a compatible bottom support surface. Also, the variability in bubble size appears to be due to a lack of quality control by the manufacturer.