Horizontal spirit level vial, unbreakable, made of acrylic glass, leak-proof, highest precision. Better readability.
Rectangular spirit level vial block, line markings all around.
The display area ist upwardly rounded. This leads to a better readability from the top and from the side. The liquid filled area and the bubble appear bigger. When reading from a slant from above or from the side the optical illusion of a seemingly double bubble does not appear here .