Material:borosilicate glass tube with one red line or one red line and two white line.
OD 15mm,wall thickness 2.5mm,ID 10mm,length 500mm,30pcs in pack.
Featuring a bold red line running along the length of the tube, this gauge glass enhances fluid visibility through optical refraction. When liquid fills the tube, the red line appears magnified across the liquid column, creating a sharp contrast that makes water and fluid levels instantly legible from a distance.
Designed specifically for steam boilers and industrial pressure vessels, it ensures fast, accurate monitoring to maintain safe, dependable operations.