


Red Sea Magnesium Pro - Reagent Refill Kit - R21416
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Red Sea Magnesium Pro - Reagent Refill Kit - R21416Red Sea's Magnesium Pro Test Kit is an advanced titration test, measuring the level of magnesium in your reef aquarium to an exceptionally high accuracy of 20 ppm. This test kit enables the accurate dosing of Red Sea's Reef Foundation C supplement (magnesium) which is part of the complete Red Sea Reef Care Program. Specifications: Test type: Titration Test range: Accuracy: 20 ppm Titrator included inside easy to use, single hand, high precision
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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★★★★★ 5
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Perfect for my application. I installed mine in my metal garage cabinets to allow me a place to store equipment battery chargers out of sight.
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Reviewed in the United States on May 6, 2026
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Reviewed in the United States on May 7, 2026
★★★★★ 4
3 inches plus!
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It works well BUT you will need a little more than a three inch opening. I ordered this as a replacement for a plain plastic grommet. I had to buy an attachment for my drill to make the hole a tad bigger and smooth out any bumps in the hole.
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Reviewed in the United States on July 19, 2025
★★★★★ 5
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★★★★★ 5
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