See below how to check measurements for different parts
How to Measure Your Wrist

Use a tape measure or paper tape and mark the measurement with a surplus of approximately 2.5cm. Do not mark too much than 2.5cm or so, otherwise it may not fit in the hand or be wide and fall.
How to Measure Your Finger

To measure a finger to buy a ring, use a ribbon or small cord, place it around the finger without squeezing and the wider area of the finger, to ensure that the ring passes in that area. Then it will be cut close or mark with a marker and put on a ruler to verify the measurement.