In households and factories, flow meters are used to check the flow, pressure gauges to measure the pressure of gases and liquids, and thermometers to measure temperature. These instruments are often used under very harsh conditions with various chemicals, pressures, and temperatures. For such measuring functions, tempered glass is used in the instruments and display parts. MARUJOU supplies cover glass for meters in various fields.

The glass used for meters outdoors is exposed to high-temperature environments and the ultraviolet rays of the sun in summer, but the glass does not deteriorate. Additionally, flow meters used in factories and power plants are subjected to pressure and chemicals. By thermally tempering the glass, it is possible to increase the surface strength to 3-5 times that of normal glass.