This is a technology dominated era. The technological advancements demands precision measuring devices. One such device is a gauge. By definition a gauge can be described as a device for measuring a physical quantity e.g. diameter of materials, pressure of flow, thickness, gap in space etc. Box gauge is a type of gauge that is generally used for measuring thickness. It is widely used in various precise measurement for different hardware / parts in industrial realm; one of its important application is to monitor the level of thickness-decreasing during operation of various and pressure container. Diffusely applied in manufacture fields, metal processing, and commercial inspection. The material that conduct and reflect constant sonic velocity, this product is to be applicable to used. Gauge box is a ceramic or metal box that has been grounded and lapped to a specific thickness. Long series of box of cross section 35 x 90 mm, made from high quality steel having holes for clamping two sl...