Review on Ruiwaer Circular Measurement Instrument Cylindrical by Sean Bouchard

Excellent price and delivery. The size of the bubbles in the vials is not constant. Some of the bubbles were very small and others of almost perfect size touched the midlines. The bubbles also moved back and forth from the center lines when the vials were rolled on a flat table, demonstrating the inconsistent design of the vials. For my function (sticking on the corn board) it didn't matter, but when trying to anchor the layer it can be problematic when using the layer in different positions. This item worked well for my specific use. Just pay attention to the quality of the product for your purposes.