Features:The adjustable span ring can be easily worn on the finger. Accurate measurement of length which can meet your different need.
Dental measuring ring is made of high quality alloy and aluminum material. Environmentally friendly, non-toxic, durable.
Range of root canal measurement: 0-30mm. 135 degree Ultra High Temperature Disinfection.
Dental finger rule have clear scale and accurate measurement.
Light weight and smooth surface which won't hurt your hands.