Protractor Ruler Angle Finder 180° Rotary Arm Measuring Tool Stainless Steel UFF
Round head protractor is double graduated from 0 to 180°, ruler is graduated from 0 to 10cm. Adjust protractor by loosing screw. 50-200PCS 3in1 Chlorine Dip Test Strip Hot Tub SPA Swimming Pool pH Tester Paper.