Glass Gauge Sealed Unit Measuring Tool Double Glazing Windows UPVC Lightweight and small this device is perfect for measuring double glazed units without having to take the unit out of the frame!​This double glazing measuring gauge is blue finished metal so no flexing while you measure and is used to measure the thickness of glass units and glass panes as well as being perfect for measuring cylinders, letterplates, backplates, handles and much more. An easy to use and versatile tool that's a must have for your glazing and fenestration tool kits.Specifications:Allows you to measure the thickness of double glazed units, euro cylinders and much more.Metal constructionMetal reinforced back plateSupplied in a white cardboard box.