Figure 1. Filters for HMP60, HMP110, and HMP110T 1 Plastic grid filter (fastest response time) 2 PTFE membrane filter, pore size 0.2 µm 3 Stainless steel sintered filter, pore size 38 µm 4 PTFE membrane filter with stainless steel grid, pore size 0.2 µm 5 PTFE sintered filter, pore size 20 µm Figure 2. Filters for HMP63 and HMP113 6 Plastic membrane filter, pore size 0.2 µm 7 Plastic grid filter for (portable use only, fastest response time) 8 Porous PTFE filter, pore size 20 µm 9 Stainless steel sintered filter, pore size 38 µm All filters are 12 mm in diameter.