Transparent type is also manufactured from "extra-hard" borosilicate glass. The surfaces on both sides are finely smooth and ensure optimal transparency. A) One is as same with reflex Gauge Glasses,use molds to make the semi-finished products,afterwards,ground and polish the two side to ensure optimal transparency. By this manufacturing technique,the definition isn't good. B)The other manufacturing technique is made of High Borosilicate sheet of 17mm thickness, cut the glass sheet according the detailed size and polish the side face for the smooth.This manufacturing technique glass is very clear,but the goods cost is higher. It can be used with all media at service conditions up to 6MPa and temperatures up to 430 degrees centigrade. Transparent Gauge Glass Used in Industry Pipe SIZE TypeA Weight L B S g/piece I 115 30 17 118 II 140 30 17 146 III 165 30 17 176 IV 190 30 17 200 V 220 30 17 237 VI 250 30 17 265 VII 280 30 17 303 VIII 320 30 17 334 IX 340 30 17 359 X 370 30 17 391 SIZE TypeB Weight L B S g/piece 0 95 34 17 110 I 115 34 17 132 II 140 34 17 162 III 165 34 17 195 IV 190 34 17 228 V 220 34 17 264 VI 250 34 17 301 VII 280 34 17 338 VIII 320 34 17 387 IX 340 34 17 410 X 370 34 17 461 Green Plain Gauge Glass Transparent Gauge Glass Used in Industry Pipe This green gauge glass is a kind of used in the field of petroleum, chemical industry, metallurgy, electric power, food, medicine. In the other two sides fired green glass glaze. According to the optics refraction principle, in the absence of liquid, from the glass facade, can clearly see the green color on the surface. When the fluid in the liquid level meter, the refractive index of glass and liquid is the same, the color will not be reflected, can see the white. The sizes are all customized according to clients' requests.