Frances did say that the first strip she got is a dark blue color. I think I got similar the first time from the 600/600/600 setup.

The other thing is that, the probe is about 1" thick. 1" may make some difference in meter reading. Also, the image is not focused on the probe. This may not make any difference on the semi-integrated probe cover.

Also, the test strip has to be processed perfectly. Somehow, the last time, my test strips had some blue color residual on the un-exposed paper. I believe that is the color of the Fuji paper emulsion. Maybe I did not pre-wash the paper long enough, or because I skipped the rinse stage and just washed the strips in tap (cold) water.