Hi uncon24
We purchased a Seaward check box although I think it must be a later model than the one you are using. The values for the test points on the check box are written on the back of the check box. Is this not the same for yours? I can do a check for our manual for this tomorrow.
You may want to check out the Seaward web site as they have an excellent range of downloadable faq's and manuals. Also Seaward have their own forum, which if you pose the question there you may get a response from their support team or other users.
You may also want to check out this thread
viewtopic.php?f=14&t=290where we are currently developing some software to record the interim checks of testers between calibrations.
Lorna has programmed this software and is very close to having a beta version that can be looked at if you want to try it.
Regards, Richard.