Test kits

[ChefFish]

Try using a small funnel (Bed, Bath & Beyond) when adding the reagent to avoid spilling any, and help to keep things consistent. Personally I like Hanna for po4 & kh, haven't found any other test kits I like much.

[Ryan7]

Have used them all over the years.

The only ones I will use now based on price,ease of use, accuracy are;

Calcium - Elos
Alk/KH - Salifert
Mag - Salifert
Phos - Elos

[e46er]

i use ELOS for
calcium
alk.
magnesium
nitrate
ammonia in the QT

and a hanna checker for phosphate