Color coded markings on our stainless steel probes are used to assess pocket depths, periodontal attachment levels, and gingival bleeding. Williams probe markings: 1-2-3-5-7-8-9-10 probe markings 11.5B probe markings: (Ball tip) .5-3.5-5.5-8.5-11.5 Double-ended Available in hollow, ergonomic handle H4