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| LaMotte | Colorimetric. Adaptation of the o-cresophthalein complexone method | $27 |
| Hanna checker | Colorimetric. Adaptation of Zincon method | $20.99 for 25 tests. |
| Hach | Titration. Calmagite EDTA & EGTA chelation test | $63.89 for 100 tests (both calcium and magnesium) |
| API | EDTA Titration. contains Erichrom Blue Black R (listed as Mordant Black 17 in msds) as endpoint indicator. | $8 |