At the moment I don't have access to a darkroom. I do however plan to build one in my basement in the not to distant future (I hope). In the meantime I want to continue to shoot black and white negatives. I am planning on using a cold light diffusion head and enlarge on vc paper. I also want to change the film developer I'm using. I'll be using FP4 developed in pyrocat-hd. Is there any way I can do testing of EI and dev. times without an enlarger?