Marine Water Aquarium Test Kits

581 results

New listingHanna Checker Set
Pre-owned
£125.48
or Best Offer
£3.42 P&P
Hanna Master Test Kit + Salinity Tester Bundle
Pre-owned
£312.68
or Best Offer
£4.48 P&P
6-in-1 FISH TANK TEST STRIPS MARINE TROPICAL AQUARIUM TEST STRIPS 100pcs IN-326
Brand new
£7.95
Free postage
Click & Collect
471 sold
NT Labs Marine Lab Multi Test Kit Master Reef NH3 NO2 NO3 pH Aquarium Fish Tank
Brand new
£27.45
Free postage
Click & Collect
SALIFERT PROFI TEST KIT RANGE MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK
Brand new · Salifert
(31)
£10.50 to £34.95
Free postage
Click & Collect
111 sold
API Test Kits Ammonia Nitrate Nitrite pH KH GH Phosphate Freshwater Marine
Brand new · API
(7)
£8.49 to £19.99
Free postage
Click & Collect
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
(£24.49/Unit)
Free postage
Click & Collect
273 sold
SEACHEM AMMONIA ALERT TEST KIT AMMONIA MONITOR MARINE FRESH AQUARIUM FISH TANK
Brand new · Seachem
(98)
£11.05
Free postage
Click & Collect
4,158 sold
TMC Salifert Profi Test Kit Saltwater Marine Reef Water Testing Coral Fish Tank
Brand new · Salifert
(13)
£10.09 to £13.40
Free postage
Click & Collect
96 sold
HI782 Marine Nitrate High Range Checker - Hanna Instruments
Pre-owned
£54.76
£7.99 P&P
Click & Collect
Hanna Checker High Range Marine Nitrate HI-782 Pocket Checker /Reagent pack
Brand new
£29.99
Free postage
Click & Collect
70 sold
Reef Zlements ICP Saltwater Test Kits Send Off Specialist Testing Aquarium Fish
Brand new
£28.99 to £39.99
Free postage
Click & Collect
48 sold
SEACHEM AMMONIA ALERT TEST KIT AMMONIA MONITOR MARINE FRESH AQUARIUM FISH TANK
Brand new · Seachem
(98)
£10.85
Free postage
Click & Collect
26 sold
SALIFERT TEST KIT SET MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK FULL SET
Brand new · Salifert
(15)
£74.99
Free postage
Click & Collect
168 sold
API MASTER TEST KITS FRESH WATER MARINE REEF SALTWATER STRIPS WATER FISH TANK
Brand new · API
(7)
£12.99 to £32.99
Free postage
Click & Collect
172 sold
Hanna 35ppt Salinity Calibration Sachet x1 (20ml)
Brand new
£3.99
Free postage
58 sold
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
Click & Collect
82 sold
API Saltwater Master Test Kit exp 03/26
Brand new · API
(69)
£18.27
or Best Offer
£2.94 P&P
Hanna HI-774-25 Reagents for the HI-774 Marine phosphate ULR Checker *low price*
Brand new
£17.99
Free postage
Click & Collect
215 sold
Hanna Marine Phosphorus ULR Checker Ultra Low Marine Aquarium
Pre-owned
£47.48
or Best Offer
£3.38 P&P
NT Labs Marine Lab Multi Test Kit Reef NH3 NO2 NO3 pH KH Mg Ca PO4 Aquarium Tank
Brand new
(1)
£31.99
Free postage
Click & Collect
67 sold
Hanna Marine Phosphate Ultra Low Pocket Checker Handheld Testing Kit
Brand new
£82.97
Free postage
Click & Collect
13 watching
Hanna Copper High Range Checker HR / Reagent refill pack
Brand new
£19.99 to £92.99
Free postage
Click & Collect
11 sold
NT LABS MARINE MULTI AND REEF TEST KITS FOR AQUARIUM FISH TANKS TESTING KITS
Brand new · Aqua Medic
(1)
£27.75 to £33.95
Free postage
Click & Collect
SALIFERT TEST KIT SET MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK NH3 NO2 NO3
Brand new
£28.99
Free postage
Click & Collect
150 sold
SALIFERT TEST KIT SET MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK KH MG CA
Brand new
£34.95
Free postage
Click & Collect
241 sold
Seachem Ammonia Alert Stick On Aquarium Monitor Test Kit NH4 Fish Tank
Brand new · Seachem
(98)
£10.85
Free postage
Click & Collect
269 sold
Hanna Marine Phosphorus ULR Checker HI-736, 19 Reagents And Calibration Kit
Pre-owned
£23.04
£3.38 P&P
2 bids
1d 16h
Hanna Marine Phosphorus ULR Checker Ultra Low Marine Aquarium
Pre-owned
£54.76
£7.99 P&P
Click & Collect
Oceamo ICP Saltwater Test Kits Send Off Specialist Testing Aquarium Reef Marine
Brand new
£39.99
Free postage
77 sold
Neptune Trident Reagent Needle Guides
Brand new
£18.99
£2.50 P&P
Click & Collect
API Test Tube STATION Holder Rack Tropical Marine Fish Tank Aquarium
Brand new · API
£11.75 to £14.50
Free postage
Click & Collect
20 sold
Hanna Marine Master kit BAND NEW HI97115UC
Brand new · Hanna
£320.05
£77.57 P&P
14 sold
Esha Aquarium Water Treatment Test Strip Algae Fish Tank Freshwater Marine
Brand new
(12)
£6.95 to £29.99
Free postage
Click & Collect
27 sold
NT LABS MARINE LAB TEST KITS TESTING KITS SALTWATER FISH AQUARIUM TEST
Brand new
(2)
£9.85 to £12.75
Free postage
Click & Collect
REEF ZLEMENTS ICP TEST ***UK lab testing super fast results ****
Brand new
£28.85
Free postage
Click & Collect
95 sold
Hanna Phosphate Checker Marine Aquarium
Pre-owned
£42.28
or Best Offer
£2.94 P&P
Hanna Instruments Marine Alkalinity DKH Checker HC Checker for Marine Fish
Pre-owned
£52.68
or Best Offer
£2.94 P&P
$10°C~30°C 0-100‰ Salinity Refractometer Aquarium Sea Salt Water Tester w/ ATC J - Image 1 of 4$
10°C~30°C 0-100‰ Salinity Refractometer Aquarium Sea Salt Water Tester w/ ATC J
Brand new · Unbranded
£17.75
Free postage
Seachem Ammonia Alert Test Kit (1year) Monitors Marine & Fresh Water Aquarium
Brand new · Seachem
(98)
£11.99
Free postage
Click & Collect
134 sold
API Test Kits Aquarium Water Testing pH NO2 NO3 Liquid Strips Master Fresh Marin
Brand new · API
(7)
£6.79 to £35.96
Free postage
Click & Collect
HANNA HI 772-26
Brand new
£16.99
Free postage
Click & Collect
67 sold
Hanna Alkalinity Checker for Marine Systems With Reagent And Calibration Set
Pre-owned
£23.04
£3.38 P&P
2 bids
1d 16h
New listingHI782 Marine Nitrate High Range Checker - Hanna Instruments
Pre-owned
£1.13
£3.38 P&P
1 bid
2d 22h
New listingHanna Marine Phosphorus ULR Checker Ultra Low Marine Aquarium
Pre-owned
£1.13
£3.38 P&P
1 bid
2d 22h
New listingHanna Alkalinity Marine dKH Pocket Checker - Digital Aquarium Test Kit
Pre-owned
£1.13
£3.38 P&P
0 bids
2d 22h
Hanna HI-774-25 Reagents for the HI-774 Marine phosphate ULR Checker. 25 Tests
Brand new
£17.95
Free postage
Click & Collect
2 watching
Reef Zlements ICP - Advanced Test
Brand new
£38.87
Free postage
Salifert Calcium Magnesium Kh/alk test kit (one of each)
Brand new · Salifert
(9)
£33.99
Free postage
Click & Collect
SALIFERT pH PROFI TEST KIT FOR SALTWATER MARINE (50 TESTS) FISH TANK AQUARIUM
Brand new
£10.25
Free postage
Click & Collect
425 sold
Salifert Magnesium MG & Calcium CA Profi Test Kit Marine Fish Tank Reef Aquarium
Pre-owned · Salifert
(31)
£1.13
£2.94 P&P
1 bid
23h 14m
REEF ZLEMENTS ICP TEST ***UK lab testing super fast results ****
Brand new
£21.48
or Best Offer
£3.38 P&P
NT LABS Test Tube STATION Holder Rack Tropical Marine Fish Tank Aquarium
Brand new
£11.75 to £19.75
Free postage
Click & Collect
14 sold
Hannah Ph Marine Checker Aquarium Water Test Handheld Colorimeter H1780
New (other)
£52.68
£3.38 P&P
Aquaforest Test Pro Kit Alkalinity Ca Mg Nitrate Phosphate Aquarium Fish Tank
Brand new
(3)
£14.99 to £44.95
Free postage
Click & Collect
121 sold
JBL Pro Aquatest Lab Marin Complete Test Kit Marine Reef Aquarium Fish Tank
Brand new · JBL
£87.95
Free postage
Click & Collect
89 sold
Hanna HI-782-25 Marine High Range Nitrate Reagents x25 Tests
Brand new
£26.95
£3.45 P&P
Click & Collect
NT LABS CORAL DIP 30ml PARASITE REMOVER SAFE FOR CORAL MARINE REEF AQUARIUM TANK
Brand new
(2)
£11.99
Free postage
Click & Collect
452 sold
SALIFERT TEST SET PO4 NO3 ALGAE MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK
Brand new
£23.99
Free postage
Click & Collect
61 sold
Oceamo The Most Advanced and Comprehensive ICP Analysis Available for your Reef
Cheapest & most Advanced analysis in the UK
Brand new
£38.99
Free postage
Click & Collect

Best selling

See all

Salifert MG Profi Test Kit Magnesium 50 Tests Marine Aquarium Fish Tank
(31)
£11.79 New
£9.56 Used
Salifert 22040 Test Kit
(9)
£13.40 New
£8.00 Used
Salifert Nitrate Profi Test Kit Marine Reef Fish
(15)
£12.45 New
Seachem Ammonia Alert for Freshwater and Marine Water
(98)
£10.85 New
NT Labs Marine Lab Multi Test Kit Reef KH MG Ca Po4 Aquarium Tank
£27.45 New
Salifert Phosphate Test Kit Phosphate 60 Tests For Aquarium
(9)
£11.75 New
API Saltwater Master Test Kit
(69)
£17.00 New
Salifert I2 Profi Test Kit Iodine 40 Tests Saltwater Aquarium Fish Tank
(6)
£18.99 New

Top-rated

See all

API Saltwater Master Test Kit
(69)

100% agree - Would recommend
£17.00 New
Salifert 5189 pH Test Kit - 45 g
(9)

100% agree - Would recommend
£10.09 New
£9.56 Used
Salifert 22040 Test Kit
(9)

100% agree - Good value
£13.40 New
£8.00 Used
Seachem Ammonia Alert for Freshwater and Marine Water
(98)

95% agree - Would recommend
£10.85 New
Salifert MG Profi Test Kit Magnesium 50 Tests Marine Aquarium Fish Tank
(31)

100% agree - Would recommend
£11.79 New
£9.56 Used
Salifert Nitrate Profi Test Kit Marine Reef Fish
(15)

100% agree - Would recommend
£12.45 New
Salifert Phosphate Test Kit Phosphate 60 Tests For Aquarium
(9)

100% agree - Would recommend
£11.75 New
API Calcium Ca2 Saltwater Only Aquarium Test Kit
(7)

85% agree - Would recommend
£11.65 New

Test/Treatment Parameter

Marine Water Aquarium Test Kits

Shop by category

581 results

New listingHanna Checker Set

Hanna Master Test Kit + Salinity Tester Bundle

6-in-1 FISH TANK TEST STRIPS MARINE TROPICAL AQUARIUM TEST STRIPS 100pcs IN-326

NT Labs Marine Lab Multi Test Kit Master Reef NH3 NO2 NO3 pH Aquarium Fish Tank

SALIFERT PROFI TEST KIT RANGE MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK

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

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

SEACHEM AMMONIA ALERT TEST KIT AMMONIA MONITOR MARINE FRESH AQUARIUM FISH TANK

TMC Salifert Profi Test Kit Saltwater Marine Reef Water Testing Coral Fish Tank

HI782 Marine Nitrate High Range Checker - Hanna Instruments

Hanna Checker High Range Marine Nitrate HI-782 Pocket Checker /Reagent pack

Reef Zlements ICP Saltwater Test Kits Send Off Specialist Testing Aquarium Fish

SEACHEM AMMONIA ALERT TEST KIT AMMONIA MONITOR MARINE FRESH AQUARIUM FISH TANK

SALIFERT TEST KIT SET MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK FULL SET

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

Hanna 35ppt Salinity Calibration Sachet x1 (20ml)

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

API Saltwater Master Test Kit exp 03/26

Hanna HI-774-25 Reagents for the HI-774 Marine phosphate ULR Checker *low price*

Hanna Marine Phosphorus ULR Checker Ultra Low Marine Aquarium

NT Labs Marine Lab Multi Test Kit Reef NH3 NO2 NO3 pH KH Mg Ca PO4 Aquarium Tank

Hanna Marine Phosphate Ultra Low Pocket Checker Handheld Testing Kit

Hanna Copper High Range Checker HR / Reagent refill pack

NT LABS MARINE MULTI AND REEF TEST KITS FOR AQUARIUM FISH TANKS TESTING KITS

SALIFERT TEST KIT SET MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK NH3 NO2 NO3

SALIFERT TEST KIT SET MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK KH MG CA

Seachem Ammonia Alert Stick On Aquarium Monitor Test Kit NH4 Fish Tank

Hanna Marine Phosphorus ULR Checker HI-736, 19 Reagents And Calibration Kit

Hanna Marine Phosphorus ULR Checker Ultra Low Marine Aquarium

Oceamo ICP Saltwater Test Kits Send Off Specialist Testing Aquarium Reef Marine

Neptune Trident Reagent Needle Guides

API Test Tube STATION Holder Rack Tropical Marine Fish Tank Aquarium

Hanna Marine Master kit BAND NEW HI97115UC

Esha Aquarium Water Treatment Test Strip Algae Fish Tank Freshwater Marine

NT LABS MARINE LAB TEST KITS TESTING KITS SALTWATER FISH AQUARIUM TEST

REEF ZLEMENTS ICP TEST ***UK lab testing super fast results ****

Hanna Phosphate Checker Marine Aquarium

Hanna Instruments Marine Alkalinity DKH Checker HC Checker for Marine Fish

10°C~30°C 0-100‰ Salinity Refractometer Aquarium Sea Salt Water Tester w/ ATC J

Seachem Ammonia Alert Test Kit (1year) Monitors Marine & Fresh Water Aquarium

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

HANNA HI 772-26

Hanna Alkalinity Checker for Marine Systems With Reagent And Calibration Set

New listingHI782 Marine Nitrate High Range Checker - Hanna Instruments

New listingHanna Marine Phosphorus ULR Checker Ultra Low Marine Aquarium

New listingHanna Alkalinity Marine dKH Pocket Checker - Digital Aquarium Test Kit

Hanna HI-774-25 Reagents for the HI-774 Marine phosphate ULR Checker. 25 Tests

Reef Zlements ICP - Advanced Test

Salifert Calcium Magnesium Kh/alk test kit (one of each)

SALIFERT pH PROFI TEST KIT FOR SALTWATER MARINE (50 TESTS) FISH TANK AQUARIUM

Salifert Magnesium MG & Calcium CA Profi Test Kit Marine Fish Tank Reef Aquarium

REEF ZLEMENTS ICP TEST ***UK lab testing super fast results ****

NT LABS Test Tube STATION Holder Rack Tropical Marine Fish Tank Aquarium

Hannah Ph Marine Checker Aquarium Water Test Handheld Colorimeter H1780

Aquaforest Test Pro Kit Alkalinity Ca Mg Nitrate Phosphate Aquarium Fish Tank

JBL Pro Aquatest Lab Marin Complete Test Kit Marine Reef Aquarium Fish Tank

Hanna HI-782-25 Marine High Range Nitrate Reagents x25 Tests

NT LABS CORAL DIP 30ml PARASITE REMOVER SAFE FOR CORAL MARINE REEF AQUARIUM TANK

SALIFERT TEST SET PO4 NO3 ALGAE MARINE REEF SALTWATER CORAL AQUARIUM FISH TANK

Oceamo The Most Advanced and Comprehensive ICP Analysis Available for your Reef

Best selling

Salifert MG Profi Test Kit Magnesium 50 Tests Marine Aquarium Fish Tank

Salifert 22040 Test Kit

Salifert Nitrate Profi Test Kit Marine Reef Fish

Seachem Ammonia Alert for Freshwater and Marine Water

NT Labs Marine Lab Multi Test Kit Reef KH MG Ca Po4 Aquarium Tank

Salifert Phosphate Test Kit Phosphate 60 Tests For Aquarium

API Saltwater Master Test Kit

Salifert I2 Profi Test Kit Iodine 40 Tests Saltwater Aquarium Fish Tank

Top-rated

API Saltwater Master Test Kit

Salifert 5189 pH Test Kit - 45 g

Salifert 22040 Test Kit

Seachem Ammonia Alert for Freshwater and Marine Water

Salifert MG Profi Test Kit Magnesium 50 Tests Marine Aquarium Fish Tank

Salifert Nitrate Profi Test Kit Marine Reef Fish

Salifert Phosphate Test Kit Phosphate 60 Tests For Aquarium

Hanna HI-774-25 Reagents for the HI-774 Marine phosphate ULR Checker low price

REEF ZLEMENTS ICP TEST *UK lab testing super fast results **

REEF ZLEMENTS ICP TEST *UK lab testing super fast results **