When measuring, the 4 long fingers (except the thumb) and to "Tiger mouth " Place, pinch a bit, and then measure the tool measurement, such as just four mm, then, on this basis, add 2~3mm is suitable for your ring. This specification will have some pain when wearing, please use hand sanitizer and other lubrication lubrication can be.
Some people like to wear a little looser, can choose the ring mouth a little larger.
Precautions:The scale of the vernier caliper is the correct scale in the line above "0", not the edge of the cursor;The size is the base size, in general, should be added 1-2mm to facilitate the wearing of bracelets, the elderly, hands ganglia larger and harder people should add 3-4mm.
When choosing a Dai Yu bracelet, you should be able to wear the jade bracelet into 4 long fingers (except the thumb) and to "Tiger mouth " Place, feel a little tighter, and then remove the jade bracelet, measure the inner diameter, such as just 55 mm, then, this size is suitable for your ring. When selecting, select the ring mouth large 1~2 mm, so that it can be easier to wear and remove. There are also people who are used to wearing smaller jade bracelet, or wear them and don't intend to take them down again, so that the size can be reduced by 1~2 millimeters in turn. Generally in the selection, you should try to wear it first.
When trying to wear, you can apply some detergent or soapy water on your hands, and ask people to help, with a little force to put the jade bracelet into the wrist can be.
Method IV: Wuzhishan together, ask someone to help use a soft rope to measure the circumference of the thickest part of your hand in the thinnest state and divide it by 3.14, plus 1~2mm is the inner diameter of the bracelet that fits you. For example: the length of your measurement is 170mm, then 170/3.14 1~2=55~56mm.