digital testing equipment

[LGB76]

I have a very hard time distinguishing between colors when they are close on most test tubes, I was wondering what digital testing equipment is out there that is worth buying. I have the Hanna for phosphates and it works great. I am looking for everything to be digital. Is Hanna reliable on all their devices? During cycling would the ultra low Nitrite work or is the low not going to read?

 

[Zer0.]

I like Hanna's alk tester as well, very fast and easy and give very consitent readings in my experience. I hear their cal. checker is not so good. I think the nitrate tester is only for freshwater.