Best Selling Products

Our Best Selling Products category features the most popular and trusted water testing solutions chosen by professionals and everyday users alike. From quick and easy test kits to advanced meters and reagents, these products have earned their place as customer favourites for their reliability, accuracy, and ease of use. Whether you’re testing pool water, drinking water, or industrial systems, these top picks deliver the dependable results you can count on.

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4195 products

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Hanna Instruments HI-1002/3 Process PH Electrode
Hanna Instruments
Hanna Instruments HI-1002/3 Process PH Electrode Sale price£222.30 Regular price£234.00
Save £1.33
Hanna Instruments HI-780-25 Marine pH Checker Reagents, 100 tests
Hanna Instruments
Hanna Instruments HI-780-25 Marine pH Checker Reagents, 100 tests Sale price£25.27 Regular price£26.60
HACH pH Buffer Solution, pH 10.01, 500 mL
Hach
HACH pH Buffer Solution, pH 10.01, 500 mL Sale price£20.50
HACH pH Buffer Solution, pH 4.01, 500mL
Hach
HACH pH Buffer Solution, pH 4.01, 500mL Sale price£20.50
HACH pH Buffer Solution, pH 7.00, 500 mL
Hach
HACH pH Buffer Solution, pH 7.00, 500 mL Sale price£20.50
Check₂O Aquarium Water Hardness
Johnson Analytica
Check₂O Aquarium Water Hardness Sale price£4.25
Check₂O Aquarium NitrateCheck₂O Aquarium Nitrate
Johnson Analytica
Check₂O Aquarium Nitrate Sale price£2.58
Check₂O Aquarium 6 in 1 Test StripsCheck₂O Aquarium 6 in 1 Test Strips
Johnson Analytica
Check₂O Aquarium 6 in 1 Test Strips Sale price£7.45
Check₂O Aquarium Nitrate - NitriteCheck₂O Aquarium Nitrate - Nitrite
Johnson Analytica
Check₂O Aquarium Nitrate - Nitrite Sale price£4.75
Check₂O Aquarium Nitrite
Johnson Analytica
Check₂O Aquarium Nitrite Sale price£4.25
Check₂O Aquarium Free ChlorineCheck₂O Aquarium Free Chlorine
Johnson Analytica
Check₂O Aquarium Free Chlorine Sale price£4.25
Check₂O Aquarium Carbonate HardnessCheck₂O Aquarium Carbonate Hardness
Johnson Analytica
Check₂O Aquarium Carbonate Hardness Sale price£4.25
Check₂O Aquarium AmmoniumCheck₂O Aquarium Ammonium
Johnson Analytica
Check₂O Aquarium Ammonium Sale price£5.75
Check₂O Aquarium AmmoniaCheck₂O Aquarium Ammonia
Johnson Analytica
Check₂O Aquarium Ammonia Sale price£5.45
Check₂O VTKolor® Eco Total Hardness
Johnson Analytica
Check₂O VTKolor® Eco Total Hardness Sale price£9.43
Check₂O VTKolor® Eco Residual Hardness
Johnson Analytica
Check₂O VTKolor® Eco Residual Hardness Sale price£16.82
Check₂O VTKolor® Eco Phosphate
Johnson Analytica
Check₂O VTKolor® Eco Phosphate Sale price£14.71
Check₂O VTKolor® Eco pH
Johnson Analytica
Check₂O VTKolor® Eco pH Sale price£12.09
Check₂O VTKolor® Eco Nitrite
Johnson Analytica
Check₂O VTKolor® Eco Nitrite Sale price£10.68
Check₂O VTKolor® Eco Nitrate
Johnson Analytica
Check₂O VTKolor® Eco Nitrate Sale price£15.24
Check₂O VTKolor® Eco Free Chlorine
Johnson Analytica
Check₂O VTKolor® Eco Free Chlorine Sale price£9.28
Check₂O VTKolor® Eco Carbonate Hardness
Johnson Analytica
Check₂O VTKolor® Eco Carbonate Hardness Sale price£8.59
Check₂O VTKolor® Eco Ammonium
Johnson Analytica
Check₂O VTKolor® Eco Ammonium Sale price£16.19
Check₂O Pool & Spa IronCheck₂O Pool & Spa Iron
Johnson Analytica
Check₂O Pool & Spa Iron Sale priceFrom £4.35

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