Glass microsphere dose calibration unit for road markings has grooved collection plate

摘要

A glass microsphere dosing calibration unit is a portable grooved plate (1) with alignment notches (7-11) and graduated collection cavities under a transparent lid (6) with strip width markings (12-16) for direct reading when lifted to the vertical and two retro reflecting strips (4) detected by a photo electric cell (17) temporarily fixed to the dosing machine.