Number of characteristic colonies counted | Number of characteristic colonies to be sampled |
≤5 | Collect all characteristic colonies |
6 - 30 | 5 |
31 - 40 | 6 |
41 - 55 | 7 |
56 - 70 | 8 |
71 - 90 | 9 |
91 - 110 | 10 |
111 - 135 | 11 |
136 - 150 | 12 |