The utility model discloses a glass body bar type measuring tool scale enlargies to help reads ware, include fixed bolster, the lens that reflects light, put large -lens, the reflection of light lens,put the left and right both ends that large -lens placed the fixed bolster respectively in. Still be provided with on the fixed bolster and be used for the fixing device of fixed glass body bar typemeasuring tool, fixing device is close to reflection of light lens. Fixing device is the rolling ring. Reflection of light lens is rotatory reflection of light lens. Rotatory reflector piece is installed on the axle sleeve seat through the pivot at self both ends, the left end at the fixed bolster is fixed to the axle sleeve seat. Set up radial spacer pin in the pivot. The right -hand member of fixed bolster is provided with the retainer plate that is used for placing large -lens. The utility model discloses a change the reflection of light angle that the lens locate, improve the illuminationintensity of the bar -shaped measurement instrument reading environment of the glass body, the amplification effect of rethread magnifying glass, scale, enlarged reading are certainly indicateed to the difficult bar -shaped measurement instrument of observing of the glass body in will using.