Dental Digital Shade Guide Tooth Color ComparatorDental Digital Shade Guide Tooth Color Comparator. Multiple algorithm to get the true color. Strong resistance to light interference. Little affected by temperature, even the ambient temperature is low to 5C, it can still be used. Overview Multiple algorithm to get the true color Strong resistance to light interference Little affected by temperature, even the ambient temperature is low to 5C, it can still be used Built in rechargeable lithium battery,