Japanese ring gauge for finger size measurement (can measure No. 1 to No. 28). Most ring gauges that can be measured up to a size 33 are Hong Kong standard numbers, so you may need to check this before making your purchase, but this is a Japanese standard product. In addition, the original protective storage bag for the ring gauge is included in the set, so you can store it safely when not in use. The size of the ring does not change, but the size of your finger changes... How about it as a companion to your lifestyle?