The ring size of jade bracelet can be determined by field trial, red rope measurement and ruler measurement.
Jade bracelet mainly measures the number of turns according to caliper, soft ruler, ruler and other tools. Caliper number measurement, according to the caliper to measure the width of the palm tiger's mouth, to judge the size of the jade bracelet ring number. The method of measuring the palm ring mouth with caliper is more efficient, and of course the error is also a little larger.