- Combination instruments for probing caries and periodontium.
- Single-ended
- WHO probe was developed for CPITN method.
- Diagnosis:
- 0 = healthy
- 1 = bleeding during probing
- 2 = supra- and/or subgingival calculus, filling or crown excesses
- 3 = gingival pockets to 5mm
- 4 = pockets deeper than 6mm