For 120 roll film this worked well for me. When I was shooting 6x7 my tests found that an EI of 64 in dil (h) or 1:63 at 68 deg was very nice. I used a syringe to extract the developer from concentrate. Strangely enough----at 4 min and 30sec in a small tank with agitation at 4 inversions in 5 sec every 30 sec. I was concerned in the beginning that development under 5 minutes was going to be problematic but it really did well.