17 models to compare

Aquarium test strips or liquid kit?

API 5-in-1 and Tetra 6-in-1 strips supply 25 per pack; API Freshwater Master supplies 800 tests across five checks.

Quantity differs from coverage. Reef Master and HI772 do not cover ammonia.

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With no preferences selected: API 5-in-1 Aquarium Test Strips is one option to compare.

No hands-on testingMethod and sources

API 5-in-1 Aquarium Test Strips · first with a product link

Model / item: 33G
  • Number of tests: 25 tests.
  • Parameters: Nitrate Nitrite pH Kh Gh.
What to note:

Parameters count: 5 parameters.

View at API

If you choose Over 90 tests for number of tests, the first option with a product link becomes API Freshwater Master Test Kit.

17 aquarium water test kits compared; 15 have a product-page link.

The picks

5 options to compare

Compare the details that matter to your setup.

An option to compare

API 5-in-1 Aquarium Test Strips

Number of tests: 25 tests.

Model / item: 33G

Key details

  • Parameters: Nitrate Nitrite pH Kh Gh.

What to note

Parameters count: 5 parameters.

Number of tests: 25 testsParameters count: 5 parametersParameters: Nitrate Nitrite pH Kh Gh
See all 6 specs
Number of tests25 tests
Parameters count5 parameters
ParametersNitrate Nitrite pH Kh Gh
Water typeFreshwater Saltwater
Test formatStrip
Titration or reagentNo

6 of 6 specs available · source checked July 1, 2026 · Source ↗
API · Product page checked September 26, 2026

View at API
Number of tests: Over 90 tests

API Freshwater Master Test Kit

Number of tests: 800 tests.

Model / item: 34

Key details

  • Parameters count: 5 parameters.

What to note

Parameters: Ammonia Nitrite Nitrate pH Low High pH.

Number of tests: 800 testsParameters count: 5 parametersParameters: Ammonia Nitrite Nitrate pH Low High pH
See all 6 specs
Number of tests800 tests
Parameters count5 parameters
ParametersAmmonia Nitrite Nitrate pH Low High pH
Water typeFreshwater
Test formatLiquid
Titration or reagentYes

6 of 6 specs available · source checked July 1, 2026 · Source ↗
AJ’s Paradise Pond Supplies · Product page checked September 26, 2026

Water type: Marine

Hanna Instruments Marine Alkalinity Checker HC

Number of tests: 25 tests.

Model / item: HI772

Key details

  • Parameters: Alkalinity.

What to note

Parameters count: 1 parameters.

Number of tests: 25 testsParameters count: 1 parametersParameters: Alkalinity
See all 6 specs
Number of tests25 tests
Parameters count1 parameters
ParametersAlkalinity
Water typeMarine
Test formatChecker
Titration or reagentYes

6 of 6 specs available · source checked July 1, 2026 · Source ↗
HelloReef · Product page checked September 26, 2026

Also compare 4

API GH and KH Test Kit

Parameters count: 2 parameters.

Model / item: 58

Key details

  • Parameters: General Hardness Carbonate Hardness.

What to note

Number of tests: 90 tests.

Number of tests: 90 testsParameters count: 2 parametersParameters: General Hardness Carbonate Hardness
See all 6 specs
Number of tests90 tests
Parameters count2 parameters
ParametersGeneral Hardness Carbonate Hardness
Water typeFreshwater
Test formatLiquid
Titration or reagentYes

6 of 6 specs available · source checked July 1, 2026 · Source ↗
API · Product page checked September 26, 2026

View at API
Also compare 5

API Nitrate Test Kit

Number of tests: 90 tests.

Model / item: 33

Key details

  • Parameters: Nitrate.

What to note

Parameters count: 1 parameters.

Number of tests: 90 testsParameters count: 1 parametersParameters: Nitrate
See all 6 specs
Number of tests90 tests
Parameters count1 parameters
ParametersNitrate
Water typeFreshwater Saltwater
Test formatLiquid
Titration or reagentYes

6 of 6 specs available · source checked July 1, 2026 · Source ↗
API · Product page checked September 26, 2026

View at API

Comparing API 5-in-1 Aquarium Test Strips · API Freshwater Master Test Kit

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The facts that differ

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1 identical spec shown. Details that do not apply to these models are omitted.

Published specification comparison
SpecAPI 5-in-1 Aquarium Test StripsModel / item: 33GNo preferences selected.API Freshwater Master Test KitModel / item: 34No preferences selected.
Number of tests25 tests800 tests
Parameters count5 parameters5 parameters
ParametersNitrate Nitrite pH Kh GhAmmonia Nitrite Nitrate pH Low High pH
Water typeFreshwater SaltwaterFreshwater
Test formatStripLiquid
Titration or reagentNoYes

API 5-in-1 Aquarium Test Strips

Model / item: 33G

No preferences selected.

Number of tests
25 tests
Parameters count
5 parameters
Parameters
Nitrate Nitrite pH Kh Gh
Water type
Freshwater Saltwater
Test format
Strip
Titration or reagent
No

API Freshwater Master Test Kit

Model / item: 34

No preferences selected.

Number of tests
800 tests
Parameters count
5 parameters
Parameters
Ammonia Nitrite Nitrate pH Low High pH
Water type
Freshwater
Test format
Liquid
Titration or reagent
Yes

API 5-in-1 Aquarium Test Strips

View at API

API Freshwater Master Test Kit

View at AJ’s Paradise Pond Supplies

Compare all 17 models

— = no verified listing yet. The published order is independent of links.

All models and their decision specs
ProductHow it comparesKey specCompareAction
API 5-in-1 Aquarium Test Strips
Compared with API Freshwater Master Test Kit: number of tests, 25 tests vs 800 tests.
Model / item: 33G
Number of tests: 25 testsView at API
API Freshwater Master Test Kit
Compared with API GH and KH Test Kit: number of tests, 800 tests vs 90 tests.
Model / item: 34
Number of tests: 800 testsView at AJ’s Paradise Pond Supplies
API GH and KH Test Kit
Compared with API Nitrate Test Kit: parameters count, 2 parameters vs 1 parameters.
Model / item: 58
Number of tests: 90 testsView at API
API Nitrate Test Kit
Compared with API Nitrite Test Kit: number of tests, 90 tests vs 180 tests.
Model / item: 33
Number of tests: 90 testsView at API
API Nitrite Test Kit
Compared with API Reef Master Test Kit: number of tests, 180 tests vs 550 tests.
Model / item: 134
Number of tests: 180 testsView at API
API Reef Master Test Kit
Compared with API Saltwater Master Test Kit: parameters, Calcium Carbonate Hardness Phosphate Nitrate vs Ammonia Nitrite Nitrate pH.
Model / item: 402M
Number of tests: 550 testsView at API
API Saltwater Master Test Kit
Compared with Hanna Instruments Marine Alkalinity Checker HC: number of tests, 550 tests vs 25 tests.
Model / item: 401M
Number of tests: 550 testsView at AquaCave
API 5-in-1 Aquarium Test Strips
Compared with API Freshwater Master Test Kit: number of tests, 25 tests vs 800 tests.
Model / item: 33G
Number of tests: 25 tests
View at API
API Freshwater Master Test Kit
Compared with API GH and KH Test Kit: number of tests, 800 tests vs 90 tests.
Model / item: 34
Number of tests: 800 tests
API GH and KH Test Kit
Compared with API Nitrate Test Kit: parameters count, 2 parameters vs 1 parameters.
Model / item: 58
Number of tests: 90 tests
View at API
API Nitrate Test Kit
Compared with API Nitrite Test Kit: number of tests, 90 tests vs 180 tests.
Model / item: 33
Number of tests: 90 tests
View at API
API Nitrite Test Kit
Compared with API Reef Master Test Kit: number of tests, 180 tests vs 550 tests.
Model / item: 134
Number of tests: 180 tests
View at API
API Reef Master Test Kit
Compared with API Saltwater Master Test Kit: parameters, Calcium Carbonate Hardness Phosphate Nitrate vs Ammonia Nitrite Nitrate pH.
Model / item: 402M
Number of tests: 550 tests
View at API
API Saltwater Master Test Kit
Compared with Hanna Instruments Marine Alkalinity Checker HC: number of tests, 550 tests vs 25 tests.
Model / item: 401M
Number of tests: 550 tests
17 catalog models

How the comparison works

Your choices are compared with each model’s product details. A missing or conflicting value stays unknown and cannot satisfy a choice you select. The starting order helps you browse; it does not rate real-world performance.

Source dates appear with each link below. A source date does not confirm today's price or stock.

Sources for all 17 models

Read the parameter names before counting them

Parameter counts range from 1 to 6. API Freshwater Master covers 5 parameters with ammonia among them. Tetra EasyStrips covers 6, but its parameter names include chlorine rather than ammonia. Parameter coverage and package descriptions identify the kits, without evaluating readings against water samples or a reference instrument. The larger count does not answer the same water-quality questions. Match the actual parameters and intended water type to the measurements you need.

Pick a sampling process you can follow consistently

API Master kits use liquid reagents; Seachem Ammonia Alert is an in-tank card; Hanna Marine Alkalinity Checker uses a checker format. These formats involve different sampling and reading steps, and their names do not demonstrate accuracy. Read reagent, timing and interpretation directions for the parameter you intend to measure.

Package yield is not a refill calendar

Maker package yields range from 25 to 800 water tests. API Freshwater Master supplies the 800 endpoint; Tetra EasyStrips and Hanna’s alkalinity checker each have a 25 value. Those counts do not imply equal use across parameters and cannot predict how soon you will need refills. Read what each maker counts and which reagents are included.

Before you buy

Can I use a freshwater kit in a reef tank?

Use the water type named on the kit. API sells separate Freshwater, Saltwater and Reef Master kits because they check different values; the Saltwater Master reads ammonia, nitrite, nitrate and pH.

Which kits test just one thing?

Five do: API’s Nitrate and Nitrite kits, Salifert’s Nitrate Profi-Test (60 tests), Seachem’s MultiTest Ammonia (75 tests) and Hanna’s alkalinity checker. A single-value kit often makes sense when one reading is the one you watch. Far more from liquid. API’s 5-in-1 and Tetra’s 6-in-1 strips come 25 to a pack; API’s Freshwater Master holds 800 tests over five checks. Strips give a quick all-in-one read. Reef keepers get API’s Reef Master (550 tests) or Hanna’s HI772, alkalinity only; neither tests ammonia.

Why do some ammonia products show nothing?

Their values had been copied from other products and were removed. API’s Ammonia Test Kit and strips, Jungle’s Quick Dip and Tetra’s EasyStrips Ammonia stay on the page, but they drop out as soon as you set a filter.