Dental Probe, PQ2N. Stainless Steel Handle. The working ends are marked in mm (3-6-9-12) for precise measurements. The calibrated probe is used to 1) determine the consistency of the gingival tissue 2) survey sulcus and pockets depths 3) measure clinical attachment levels 4) measure the width of attached gingival 5) verify whether bleeding and/or purulent exudate is in presence 6) to measure horizontal and vertical pocket depth of multirooted teeth in furcation areas.