Use to conduct quantitative fit testing on 3M™ Secure Click™ Half Facepiece Respirators HF-800SD Series. Cartridges and filters not included. Use to conduct quantitative fit testing on 3M™ Secure Click™ Half Facepiece Reusable Respirators with speaking diaphragm Includes head harness assembly The 3M™ Secure Click™ Quantitative Fit Test Adapter Kit is designed to permit quantitative fit testing of 3M™ Secure Click™ HF-800SD Series Respirators with speaking diaphragm. The HF-800-03 quantitative fit test adapter is not compatible with HF-800SD Series respirators without speaking diaphragms. HF-800 facepieces without speaking diaphragms can be quantitatively fit tested by manually probing the facepiece.