Measurement method of ring mouth: 1, thin line, wrap the thin line around the root of finger to measure the size; 2. Inner diameter: the size is obtained by measuring the inner diameter of the old ring; 3, size stick, buy a special size stick tool to measure.

Take an inelastic thin line to avoid measurement error. After winding the thin thread around the finger root once, mark the intersection with a marker, unfold the thread after marking, measure the length with a ruler, and compare it with the ring table. Take a piece of paper with a width of 1 cm or a thin inelastic line, and the edge of the paper should be flat. The thin wire is inelastic, which can avoid measurement error. Wrap the paper/thin thread around the root of the finger and mark the intersection of the paper/thin thread with a marker; After scribing, unfold the paper/thin thread and measure the length of the scribing place with a ruler; After the measurement is completed, check the ring table and find the number of rings corresponding to the finger circumference. When measuring the size with paper strips or thin lines, there may be errors due to some force majeure factors, so it is best to measure several times and take the middle value; In the process of measurement, don't pull the thin wire too tightly or too loosely.

If there is a worn ring, you can directly measure the inner diameter of the ring with a ruler, or put the ring on paper, draw a circle around the inner ring with a pen, measure the circumference of the ring with a ruler, and then compare the ring number table to find the right number.

Buy a special tool for measuring finger size, called ring size bar, which consists of a graduated size bar and a circle of different sizes. Put on the rings one by one and read the lettering number.