iM3 Explorer/Measuring Probe. The probe end has periodontal markings 1,2,3,5,7,8,9,10 mm. The fine but robust tip is ideal for periodontal probing in the cat or dog. The markings are indented into the probe and will not fade even after many autoclave cycles. The other end has a shepherd hook explorer to detect tooth defects both supra and subgingivally. D1010.