... . The features of mechanics, mechanical, electric and optics of quartz glass tube are superior to nominal glass tube. Furthermore, it ... of resist compression, convenience to install, protect and maintain.quartz glass tubular level gauge is a upgraded products of common ... 4MPa4)meter material: high quality carbon steel or 1Cr18Ni9Ti5)back light: a,light Emitting Diode: electric power supply is 24VDC. b, ...