Water Testing Kits

Hi everybody this is my first post here. I have been keeping Koi Carp for 21 years and we have just set up a small aquarium keeping tropical fish in. My question is I have been using ntl labs 200 multi test. If you look at the aquarium lab test the only difference I can see is the packaging. I wondering if it was safe to use my lab 200 multi test on the aquarium.
I must apologise in advance as I am dyslexic and my wife does all the typing so if I do not get back to you very quickly that is why.
Any help would be gratefully appreciated.

As far as I'm aware, there are two types of testers - fresh water and salt water, though in a lot of cases it's just the colour chart that's different, the fresh and marine versions by the same manufacturer often use the same bottles.