A level is only useful if you can read the vials. This level comes equipped with oversized 1/2 in. Not only are the vials themselves easy to read, but the level has more vials than competitive models in 48 in and longer lengths, meaning the vials are always within eyeshot, even at awkward angles. Finally, Johnson’s SurroundView technology maximizes visibility and top read windows allow the user to stand over the work to view the vials.Oversized 1/2 in Dia vials are easy to readHeavy-duty aluminum frameErgonomic cushioned hand gripsSurroundView vials reflect ambient light for easy readTop-read window maximizes readabilityShock absorbing end caps protect frameTop read window maximizes readability