It states you can take two markers etc..... TO the field i.e. past the chrono and up to the tape . You may only take one marker, hopper etc ONTO the field..... i.e. through the tape. Pretty clear really........ you can take what you want to the chrono, but you've got to decide what you are taking before you actually enter the field. Lets you cover yourself for marker failure, chrono breaks and dodgy batteries etc.....
For me it's handy as I can have one marker at say 295 and one at 280, that way I know that no matter what my back up will be safe and I won't have to do any last minute dial downs at the chrono.