To answer your question, yes there is a digital way, but it is not worth it. If you are just looking to see the cycle, then an API drop kit will work. From there, you will want to invest in some good kits such as Hanna (if you are rich enough), or RedSea kits...or basically anything other then the 'Master' Saltwater API kit. That API kit works well if you have a FOWLR tank, but no use with corals.
I also would not be using a kit to test for nitrate/nitrite levels when deciding to do water changes. That is only a fresh water rule. Corals need the nutrients and chemicals that are in the salt. As levels are depleted, they need to be replenished. You will most likely need at least 10% weekly water changes. Your water change regiment will only be known once your tank is up and running and you are testing for all levels. Every change you make from there may affect that regiment and as corals grow, it may change again. Some even go as far as setting up a dosing regiment as well to reintroduce some chemicals that are depleted even quicker then water changes and fix.