4.1 measuring the asphalt softening point with the external diameter micrometer, the three diameters of the steel balls perpendicular to each other are measured, and the weight is also called by the analytical balance.
4.2 check the asphalt softening point to determine whether the surface of steel ball and specimen ring is rusty or incomplete.
4.3 and the outer diameter micrometer measure the sample ring to show the size of each part.
4.4 the distance between the lower edge of the support bearing ring and the bearing plate is measured by the vernier caliper.
4.5 measuring the size of heat resistant hot glass beaker for measuring the asphalt softening point by steel straight ruler.