alk test kit
 

What is a good one to use ?

Seems there were some bad batches but Salifert's Alk is easy to use.

Elos. After hearing about all the issues with the Salifert kits I went with Elos . Dosent have the resolution of a Salifert, ie it goes up by 1's 1, 2, 3, 4, 5 but that is good enough .
Only 1 chemical to play with and it comes in a medical grade dropper which works very nicely
Also now using an Elos Mg kit and like it as well