Pets · Head-to-head
API Freshwater Master Test Kit vs Salifert Master Reef Testing Combo Kit
Which should you buy? Our verdict on both, pulled from our full The Best Aquarium Water Test Kits: 4 Compared (and One to Skip) comparison.
The API kit covers the full nitrogen cycle plus pH in liquid reagent form and costs very little per reading, which is why it is the default recommendation for freshwater tanks. The Salifert combo is the better answer once corals are involved, because reef chemistry needs finer steps on alkalinity, calcium and magnesium than any freshwater color card provides.
API Freshwater Master Test Kit
Buy itLiquid reagents for the five numbers that decide whether a freshwater tank is safe, at a cost per test almost nothing else matches.
- Covers pH, high range pH, ammonia, nitrite and nitrate, which is the whole nitrogen cycle plus the pH you need to interpret it
- Includes seven test solutions, four test tubes, a holding tray and a laminated color card, enough for many repeat tests
- Liquid reagents in glass tubes give a far more readable color than a pad on a paper strip
- Freshwater only, with no saltwater color card in this kit
- Does not include GH, KH or phosphate, which buyers frequently assume a master kit covers
- The nitrate test is technique sensitive, requiring a hard shake of Solution #2 and careful mixing of the capped tube for the stated time
Salifert Master Reef Testing Combo Kit
Buy itSix single-parameter reef kits in one box, with the resolution on alkalinity and calcium that coral dosing actually requires.
- Bundles calcium, KH/alkalinity, magnesium, nitrate, phosphate and pH, which is the working set for a reef tank
- Reads in fine steps: about 0.3 dKH on alkalinity and 10 mg/L on calcium
- Boxes are replaced individually, so you rebuy only the parameter you actually used up
- No ammonia and no nitrite test in the combo, so a cycling tank needs Salifert's separate ammonia kit or another source
- Test counts vary widely by parameter, from about 50 on pH up to 100 to 200 on alkalinity
- Salifert's site centers its Profi-Test line on reef and marine use, so freshwater keepers get little guidance there
Side by side
The 8 criteria below are the ones our full comparison judged every product on, narrowed to these two.
| API Freshwater Master Test Kit Our pick | Salifert Master Reef Testing Combo Kit | |
|---|---|---|
| Our verdict | Buy | Buy |
| Best for | Anyone cycling or maintaining a freshwater tank who wants one purchase to cover the parameters that actually cause fish loss. | Reef keepers dosing calcium and alkalinity who want tight readings without buying a meter for every parameter. |
| Price tier | $$ · mid-range | $$ · mid-range |
| Test method | Liquid reagent, color card match | Liquid reagent, titration and color match |
| Parameters covered | pH, high range pH, ammonia, nitrite, nitrate | Calcium, KH/alkalinity, magnesium, nitrate, phosphate, pH |
| Ammonia and nitrite | Both included | Neither, both sold as separate Salifert kits |
| Tests per kit, as stated | Hundreds of tests, count varies by parameter | About 50 to 200 per parameter box, varies by test |
| Water type | Freshwater | Reef and marine |
| Smallest step you can read | Color card increments | About 0.3 dKH alkalinity, 10 mg/L calcium |
| Ongoing consumables | Individual API refill kits | Replace whichever parameter box runs out |
| Calibration check available | No | No |
Which one is right for you?
Pick the API Freshwater Master Test Kit if
anyone cycling or maintaining a freshwater tank who wants one purchase to cover the parameters that actually cause fish loss.
Know before buying: freshwater only, with no saltwater color card in this kit.
Pick the Salifert Master Reef Testing Combo Kit if
reef keepers dosing calcium and alkalinity who want tight readings without buying a meter for every parameter.
Know before buying: no ammonia and no nitrite test in the combo, so a cycling tank needs Salifert's separate ammonia kit or another source.
The bottom line
Our overall pick is the API Freshwater Master Test Kit - Liquid reagents for the five numbers that decide whether a freshwater tank is safe, at a cost per test almost nothing else matches. Choose the Salifert Master Reef Testing Combo Kit instead if reef keepers dosing calcium and alkalinity who want tight readings without buying a meter for every parameter.
Want the full picture, including the other options we compared and the popular one we'd skip? Read the complete The Best Aquarium Water Test Kits: 4 Compared (and One to Skip).