30cm Ruler with Handle Mould.
Protractor use method:1. protractor is used to measure the degree of the Angle of an instrument, generally semicircular. 2. The diameter of the semicircle is the zero scale line of the protractor, and the center of the diameter is the center of the protractor. Triangle plate use method:1.If you use a scale, you must first choose the scale you need. Different scale fractions and ranges are not the same.
2. The second is to pay attention to the location of the scale when measuring to put the correct, some of the scale is thicker, the scale should be close to the object.
3.The most critical step is the reading, reading should pay attention to the line of sight is to the scale and perpendicular to the scale surface.
4. And pay attention to is to distinguish the scale of the scale value of the number, but also to read the next digit of the scale value.
