Hanna Instruments makes the line of "Checker" colorimeters - handheld digital test instruments that read alkalinity, calcium, magnesium, phosphate, nitrate, and pH from a small water sample with a reagent. Significantly more accurate than titration test kits and faster to run.
The single most-used reef chemistry tester. Reads alkalinity in dKH or ppm to 2 decimals in 30 seconds.
Calcium reads in ppm to whole numbers. Phosphate ULR (HI774) reads to 0.001 ppm - critical for SPS reefs.
Higher-accuracy bench pH meter with replaceable probe. Better than a typical pH probe for one-off accurate pH readings.
Salifert (titration) · Red Sea (titration) · Triton ICP · Apex Trident