Williams Probe is a periodontal probe used to assess periodontal pocket depths, attachment levels, anatomy configurations and gingival bleeding. It is also called the periodontal probe and is the first probe to be used to assess probing depth of a pocket. It has markings of 1, 2, 3, 5, 7, 8, 9, and 10 mm. ^{henryschein.co.uk}+1 ^{1 2}