All plastic "No-Mar" metric gap and flushness clover gages are designed for measuring height variations and gaps. Rear side is designed for checking gaps. Front side is designed for checking flushness. These gages are furnished as "Reference Only" within +/- 10% tolerances and as "Serialized and Certified" within +/- 5% tolerances for ISO compliancy.
The #16338 gage also contains an attached serialized and certified rotating 1/2mm leaf that
the listed sizes on either side in increments of 1/2mm.