Review on Swanson Tool SL0002 Surface Level by Craig Shah

Good: Seems to work very well. The concentric rings give a good indication of the degree of (no) precision. Relatively cheap. :- The plastic surface is scratched. There was various debris and sand in the package (I wonder how it got there). Does not affect bladder visibility. Do not use for precise things: the black sphere in the center seems a bit off-center in relation to the black lines. Maybe it's just me.