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API Alkalinity/KH Aquarium Water Test Kits

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  • API 55898 5 in 1 Aquarium Test Strips - Pack of 25

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    (73)
    100% agree - Would recommend
    £4.50 New
  • API Saltwater Master Test Kit

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    100% agree - Would recommend
    £24.49 New
  • API KH Test Kit Carbonate Hardness Fish Tank Aquarium Tropical Coldwater & Pond

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    (9)
    100% agree - Would recommend
    £8.49 New
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    91% agree - Would recommend
    £4.45 New
  • API LR1800 Nitrate Aquarium Fish Tank Fresh and Salt Water Test Kit - 90 Tests

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    (33)
    100% agree - Would recommend
    £11.90 New
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    API GH & KH TEST KIT Freshwater Aquarium Water Test Kit

    (8)
    £11.49 New
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    API 55898 5 in 1 Aquarium Test Strips - Pack of 25

    (73)
    £4.50 New
  • API 5 in 1 Aquarium Test Kit - 4 Pack

    API 5 in 1 Aquarium Test Kit - 4 Pack

    (46)
    £4.45 New
  • API LR1800 Nitrate Aquarium Fish Tank Fresh and Salt Water Test Kit - 90 Tests

    API LR1800 Nitrate Aquarium Fish Tank Fresh and Salt Water Test Kit - 90 Tests

    (33)
    £11.90 New
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    API Saltwater Master Test Kit

    (69)
    £24.49 New
  • API Marine Reef Master Aquarium Test Kit Ca2 KH Po4 No3

    API Marine Reef Master Aquarium Test Kit Ca2 KH Po4 No3

    (7)
    £27.49 New
  • API KH Test Kit Carbonate Hardness Fish Tank Aquarium Tropical Coldwater & Pond

    API KH Test Kit Carbonate Hardness Fish Tank Aquarium Tropical Coldwater & Pond

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  • API 5 in 1 AQUARIUM WATER TEST KIT DIP 25 STRIPS FRESHWATER SALTWATER FISH TANK - Image 1 of 1

    API 5 in 1 AQUARIUM WATER TEST KIT DIP 25 STRIPS FRESHWATER SALTWATER FISH TANK

    Brand new · API
    (46)
    £5.99 to £12.99
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    369 sold
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  • API Test Strips 5 in 1 pH KH GH Nitrate Nitrite Aquarium Fish Tank Water Quality - Image 1 of 1

    API Test Strips 5 in 1 pH KH GH Nitrate Nitrite Aquarium Fish Tank Water Quality

    Brand new · API
    (4)
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    24 sold
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    • API MASTER SALTWATER TEST KIT MARINE pH AMMONIA FISH & REEF TANK AQUARIUM - Image 1 of 4
    • API MASTER SALTWATER TEST KIT MARINE pH AMMONIA FISH & REEF TANK AQUARIUM - Image 2 of 4
    • API MASTER SALTWATER TEST KIT MARINE pH AMMONIA FISH & REEF TANK AQUARIUM - Image 3 of 4
    • API MASTER SALTWATER TEST KIT MARINE pH AMMONIA FISH & REEF TANK AQUARIUM - Image 4 of 4

    API MASTER SALTWATER TEST KIT MARINE pH AMMONIA FISH & REEF TANK AQUARIUM

    Brand new · API
    (69)
    £29.99
    Free postage
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    • API GH & KH WATER TEST KIT FISH TANK TROPICAL POND GENERAL CARBONATE HARDNESS - Image 1 of 4
    • API GH & KH WATER TEST KIT FISH TANK TROPICAL POND GENERAL CARBONATE HARDNESS - Image 2 of 4
    • API GH & KH WATER TEST KIT FISH TANK TROPICAL POND GENERAL CARBONATE HARDNESS - Image 3 of 4
    • API GH & KH WATER TEST KIT FISH TANK TROPICAL POND GENERAL CARBONATE HARDNESS - Image 4 of 4

    API GH & KH WATER TEST KIT FISH TANK TROPICAL POND GENERAL CARBONATE HARDNESS

    Brand new · API
    (8)
    £11.99
    Free postage
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    1,440 sold
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  • API GH & KH Test Kit Freshwater Aquarium Test Kit 1-Count For Fresh Water - Image 1 of 4

    API GH & KH Test Kit Freshwater Aquarium Test Kit 1-Count For Fresh Water

    Fast & Free Delivery On All Items | Multibuy Savings
    Brand new · API
    (8)
    £11.49
    (£11.49/Unit)
    Free postage
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    475 sold
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  • API Test Kits Ammonia Nitrate Nitrite pH KH GH Phosphate Freshwater Marine - Image 1 of 1

    API Test Kits Ammonia Nitrate Nitrite pH KH GH Phosphate Freshwater Marine

    Brand new · API
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    £8.49 to £19.99
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    220 sold
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  • API MASTER TEST KITS FRESH WATER MARINE REEF SALTWATER STRIPS WATER FISH TANK - Image 1 of 2

    API MASTER TEST KITS FRESH WATER MARINE REEF SALTWATER STRIPS WATER FISH TANK

    Brand new · API
    (7)
    £12.99 to £34.99
    Free postage
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    173 sold
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  • API Saltwater Master Test Kit for Saltwater Aquarium 550-Test Kit - Image 1 of 4

    API Saltwater Master Test Kit for Saltwater Aquarium 550-Test Kit

    Fast & Free Delivery On All Items | Multibuy Savings
    Brand new · API
    (69)
    £24.49
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    274 sold
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  • API 5-IN-1 Test Strips Freshwater and Saltwater Aquarium Test Strips Pack of 100 - Image 1 of 4

    API 5-IN-1 Test Strips Freshwater and Saltwater Aquarium Test Strips Pack of 100

    Fast & Free Delivery On All Items | Multibuy Savings
    Brand new · API
    (4)
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    442 sold
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  • API Nitrate Test Kit for Freshwater & Saltwater Aquarium 90-Test Kit - Image 1 of 4

    API Nitrate Test Kit for Freshwater & Saltwater Aquarium 90-Test Kit

    Fast & Free Delivery On All Items | Multibuy Savings
    Brand new · API
    (33)
    £11.99
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    418 sold
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  • API 5 in 1 Test Strips Kit Aquarium PH Nitrate Nitrite GH KH 4 pcs - Image 1 of 1

    API 5 in 1 Test Strips Kit Aquarium PH Nitrate Nitrite GH KH 4 pcs

    Brand new · API
    (46)
    £5.49
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    Only 1 left.
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  • API Reef Master Test Kit Tests Calcium Carbonate Hardness Phosphate & Nitrite - Image 1 of 4

    API Reef Master Test Kit Tests Calcium Carbonate Hardness Phosphate & Nitrite

    Fast & Free Delivery On All Items | Multibuy Savings
    Brand new · API
    (7)
    £27.49
    (£27.49/Unit)
    Free postage
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    82 sold
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  • API NITRATE TEST KIT TROPICAL COLDWATER AND MARINE FISH TANK AQUARIUM - Image 1 of 4

    API NITRATE TEST KIT TROPICAL COLDWATER AND MARINE FISH TANK AQUARIUM

    Brand new · API
    (33)
    £11.90
    Free postage
    Click & Collect
    178 sold
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  • API AQUARIUM 5 IN 1 WATER TEST KIT TESTING FRESH OR SALT WATER MARINE FISH TANK - Image 1 of 3

    API AQUARIUM 5 IN 1 WATER TEST KIT TESTING FRESH OR SALT WATER MARINE FISH TANK

    Brand new · API
    (46)
    £6.45 to £14.95
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    2,492 sold
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  • API 5 in 1 AQUARIUM WATER TEST KIT DIP 25 STRIPS FRESHWATER SALTWATER FISH TANK - Image 1 of 2

    API 5 in 1 AQUARIUM WATER TEST KIT DIP 25 STRIPS FRESHWATER SALTWATER FISH TANK

    Brand new · API
    £8.63
    Free postage
    36 sold
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  • API GH & KH Liquid Test Kit Set Freshwater Aqurium Fish Tank Water Hardness - Image 1 of 1

    API GH & KH Liquid Test Kit Set Freshwater Aqurium Fish Tank Water Hardness

    Brand new · API
    (8)
    £11.49
    Free postage
    Est. delivery Fri, Aug 15
    Only 3 left
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  • API pH Test Kit for Freshwater Aquarium 150-Test Kit For Fresh Water - Image 1 of 4

    API pH Test Kit for Freshwater Aquarium 150-Test Kit For Fresh Water

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    (21)
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    232 sold
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  • API Pond 5 in 1 Test Strips Pack Of 4 - Garden Pond Water Test Kit Fish Health - Image 1 of 1

    API Pond 5 in 1 Test Strips Pack Of 4 - Garden Pond Water Test Kit Fish Health

    Brand new · API
    (46)
    £6.40
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    Est. delivery Fri, Aug 15
    1,099 sold
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  • API High Range pH Test Kit Freshwater & Saltwater Aquarium 160-Test Kit - Image 1 of 4

    API High Range pH Test Kit Freshwater & Saltwater Aquarium 160-Test Kit

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    Brand new · API
    (5)
    £9.25
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  • API REEF MASTER TEST KIT - Calcium Carbonate Hardness Phosphate Nitrate Aquarium - Image 1 of 2

    API REEF MASTER TEST KIT - Calcium Carbonate Hardness Phosphate Nitrate Aquarium

    Brand new · API
    (7)
    £31.49
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    Est. delivery Fri, Aug 15
    5 watching
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  • API High Range pH Test Kit Freshwater Salt Fish Marine Aquarium Water Testing - Image 1 of 1

    API High Range pH Test Kit Freshwater Salt Fish Marine Aquarium Water Testing

    Brand new · API
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    £9.96
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  • API pH Aquarium Measures Test Strips Wide Range Saltwater Dip & Read 25 Tests - Image 1 of 4

    API pH Aquarium Measures Test Strips Wide Range Saltwater Dip & Read 25 Tests

    Fast & Free Delivery On All Items | Multibuy Savings
    Brand new · API
    (1)
    £6.99
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    Was: £10.29was - £10.29
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  • API 5-IN-1 TEST STRIPS Freshwater and Saltwater Aquarium Test Strips 25-Count Bo - Image 1 of 4

    API 5-IN-1 TEST STRIPS Freshwater and Saltwater Aquarium Test Strips 25-Count Bo

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    Est. delivery Thu, Aug 14
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  • API 5 in 1 Aquarium Test Strips Aquarium Fish Tank Water Testing pH KH GH NO2 NO - Image 1 of 1

    API 5 in 1 Aquarium Test Strips Aquarium Fish Tank Water Testing pH KH GH NO2 NO

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  • API Carbonate Hardness Kit Aquarium Marine Freshwater Fish Tank Water Testing KH - Image 1 of 1

    API Carbonate Hardness Kit Aquarium Marine Freshwater Fish Tank Water Testing KH

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    £9.35
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  • API 5-IN-1 Test Strips Freshwater and Saltwater Aquarium Test Strips Pack of 4 - Image 1 of 4

    API 5-IN-1 Test Strips Freshwater and Saltwater Aquarium Test Strips Pack of 4

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  • API Liquid Nitrate Test Kit Set NO3 Freshwater & Marine Aquarium Tank - Image 1 of 1

    API Liquid Nitrate Test Kit Set NO3 Freshwater & Marine Aquarium Tank

    Brand new · API
    (33)
    £11.99
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    Est. delivery Fri, Aug 15
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  • API High Range pH Liquid Water Test Kit Tropical Coldwater & Marine Aquarium - Image 1 of 1

    API High Range pH Liquid Water Test Kit Tropical Coldwater & Marine Aquarium

    Brand new · API
    (5)
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    Only 1 left.
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  • API 5 in 1 Test Strips Kit Aquarium PH Nitrate Nitrite GH KH 25pcs - Image 1 of 1

    API 5 in 1 Test Strips Kit Aquarium PH Nitrate Nitrite GH KH 25pcs

    Brand new · API
    (73)
    £11.69
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    Est. delivery Fri, Aug 15
    Only 3 left
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  • API GH & KH Test Kit General Carbonate Hardness Liquid Aquarium Tank Alkalinity - Image 1 of 2

    API GH & KH Test Kit General Carbonate Hardness Liquid Aquarium Tank Alkalinity

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  • API KH Test Kit Liquid for Freshwater and Marine Tanks Carbonate Hardness - Image 1 of 1

    API KH Test Kit Liquid for Freshwater and Marine Tanks Carbonate Hardness

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  • API Nitrate Test Kit Liquid Aquarium Freshwater Fish Tank 90 Tests - Image 1 of 2

    API Nitrate Test Kit Liquid Aquarium Freshwater Fish Tank 90 Tests

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  • API pH Test Kit Liquid Aquarium Tank Water Quality Freshwater Checker - Image 1 of 2

    API pH Test Kit Liquid Aquarium Tank Water Quality Freshwater Checker

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    34 sold
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  • API Test Kits Ammonia GH & KH Nitrate Nitrite Ph Phosphate Ca Cu 5in1 Strips - Image 1 of 1

    API Test Kits Ammonia GH & KH Nitrate Nitrite Ph Phosphate Ca Cu 5in1 Strips

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  • API Freshwater Saltwater Nitrate Test Kit Aquarium Fish Tank Water Testing NO3 - Image 1 of 1

    API Freshwater Saltwater Nitrate Test Kit Aquarium Fish Tank Water Testing NO3

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    £13.59
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  • API Test Kits Aquarium Water Testing pH NO2 NO3 Liquid Strips Master Fresh Marin - Image 1 of 1

    API Test Kits Aquarium Water Testing pH NO2 NO3 Liquid Strips Master Fresh Marin

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  • API POND 5 IN 1 Pond Test Strips Pond Water Test Strips Pack of 25 - Image 1 of 4

    API POND 5 IN 1 Pond Test Strips Pond Water Test Strips Pack of 25

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    Brand new · API
    (5)
    £12.29
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