Next best magnessium kit

[masonicman]

I normally use Salifert mag. test kit. As everyone knows they are on back order. What the next best thing? Red sea?

[PSam]

Test results from 3 kits I have. All the same, more or less.

# Salifert - 1380
# SeaChem - 1375
# ELOS ~ 1400 (only does 100ppm resolution unless you double).