Four individual Scale inserts include Scales to measure the following: Glass Thickness (Fraction and Metric)
IG Air Space (Fraction and Metric)
Overall IG Unit Thickness when SS, DS, 1/8", and 1/4" Glass has been used or for 3 mm, 4 mm, 5mm, or 6 mm Glass
Included is an Air Space Thickness and Glass Thickness Scale for use on Laminated Glass (Fraction and Metric).
Scales are easily replaced by removing two set screws.