I've used many Salifert test kits in the past. I find them to be reliable and consistant. I haven't yet used their alkalinity test kit. Some of the Salifert kits have color charts that are almost impossible to distinguish color differences. I've been blessed with color blindness. (That was in exchange for a bald skull I guess...
).
How is the color chart with the alk. kit ? If it's hard to differentiate, it's not accurate for me.