I own one of these, purchased new. "magnetic strips with white markings" doesn't sound familar (OTOH I haven't had my darkroom set up and in use for almost 15 years!). Does this picture (from the web) help?
Yes, agree that those are likely guides to assist with making evenly spaced test strips. White marks on a black base are more visible under dim safelight, and reflect less overspilled image light, if that happens. Magnetic means they can be repositioned anywhere on the easel base they are required. They might even be DIY add-ons?
Hey guys, thanks for the imput on those strips. I'll think I'll keep them. I got really lucky on finding this. Paid less than 100.00 for it. It was never used.