The Trident tests water parameters four times a day, and provides results via Apex Fusion to monitor current Alkalinity, Calcium and Magnesium levels.This device sells out quickly due to demand versus limited availability. Feel free to contact me directly to request one and I'll see what I can do.
Two units are currently in stock! (9/1/2020)
This is a Neptune Systems product, and only works with the Apex 2016 full controller setup.