We have had a ton of positive feedback on our 33% larger, invertible vials! These vials are accurate to 0.0005"/1" and extra-high visibility for superior precision. In low-light environments (like basements) or when it's in an unusual position, the larger size and readability makes an enormous difference. We designed these levels to save time and improve accuracy, and we think they'll do just that. . . . #specopstools #toughtools #handtools #handtoolsonly #levels #construction #carpentry #framing #trades #toolsofthetrades #electrical #plumbing #tools #bluecollar