°Good Adopts super-strength transparent engineering which has good rigidity , wear resistance , no deformation , no hand light and ° Friendly Design : Increase the thickening knob , it is easy to measure , and the measurement is and °2 Angle Unit : degree and degree of random conversion °2 Length Unit : metric inch double scale line on the transparent ruler is striking and generous for easy reading °Clear Funciton : It can be cleared at any position to facilitate absolute and relative measurements, Manufacturer: Watreketal