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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4196 products

Hardness, Total, bottle of 50Hardness, Total, bottle of 50
ITS
Hardness, Total, bottle of 50 Sale price£9.00
Save £5.81
Hanna Instruments-98539 Checktemp Dip® Pocket Thermometer
Hanna Instruments
Hanna Instruments-98539 Checktemp Dip® Pocket Thermometer Sale price£110.39 Regular price£116.20
Save £13.16
Hanna Instruments1043B pH electrode - Ideal for use with Tris buffers
Hanna Instruments
Hanna Instruments1043B pH electrode - Ideal for use with Tris buffers Sale price£250.04 Regular price£263.20
Save £4.14
Hanna Instruments-98108 pocket pHep+ pH Tester & °CHanna Instruments-98108 pocket pHep+ pH Tester & °C
Hanna Instruments
Hanna Instruments-98108 pocket pHep+ pH Tester & °C Sale price£78.76 Regular price£82.90
Save £3.96
Hanna Instruments-98107 pHep pH TesterHanna Instruments-98107 pHep pH Tester
Hanna Instruments
Hanna Instruments-98107 pHep pH Tester Sale price£75.24 Regular price£79.20
Save £8.83
Hanna Instruments-98311 EC, TDS and Temperature Tester, Low RangeHanna Instruments-98311 EC, TDS and Temperature Tester, Low Range
Hanna Instruments
Hanna Instruments-98311 EC, TDS and Temperature Tester, Low Range Sale price£167.87 Regular price£176.70
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Hanna Instruments-93737 Silver, PAN method Reagents
Hanna Instruments
Hanna Instruments-93737 Silver, PAN method Reagents Sale priceFrom £231.23 Regular price£243.40
Save £34.28
Hanna Instruments-9147-04 Dissolved Oxygen Meter for Fish Farming, 4m Probe
Hanna Instruments
Hanna Instruments-9147-04 Dissolved Oxygen Meter for Fish Farming, 4m Probe Sale price£651.42 Regular price£685.70
Save £2.19
Hanna Instruments-77100P Combination pH/EC Buffer Kit 1413 uS/cm & 7.01 pH 10 x 10 sachetsHanna Instruments-77100P Combination pH/EC Buffer Kit 1413 uS/cm & 7.01 pH 10 x 10 sachets
Hanna Instruments
Hanna Instruments-77100P Combination pH/EC Buffer Kit 1413 uS/cm & 7.01 pH 10 x 10 sachets Sale price£41.61 Regular price£43.80
Save £83.02
Hanna Instruments-83314-02 Multi-parameter Wastewater & Water Photometer with COD and pH meter
Hanna Instruments
Hanna Instruments-83314-02 Multi-parameter Wastewater & Water Photometer with COD and pH meter Sale price£1,577.48 Regular price£1,660.50
Save £4.51
Hanna Instruments-715 Ammonia Medium Range Handheld Colorimeter - Checker®HC
Hanna Instruments
Hanna Instruments-715 Ammonia Medium Range Handheld Colorimeter - Checker®HC Sale price£85.69 Regular price£90.20
Save £3.75
Hanna Instruments-717 High Range Phosphate Colorimeter - Checker HCHanna Instruments-717 High Range Phosphate Colorimeter - Checker HC
Hanna Instruments
Hanna Instruments-717 High Range Phosphate Colorimeter - Checker HC Sale price£71.35 Regular price£75.10
Save £0.99
Hanna Instruments-731351 25 Tips for 1000uL Pipet
Hanna Instruments
Hanna Instruments-731351 25 Tips for 1000uL Pipet Sale price£18.81 Regular price£19.80
Save £3.75
Hanna Instruments-761 Total Chlorine Ultra Low Range Handheld Colorimeter, Checker HCHanna Instruments-761 Total Chlorine Ultra Low Range Handheld Colorimeter, Checker HC
Hanna Instruments
Hanna Instruments-761 Total Chlorine Ultra Low Range Handheld Colorimeter, Checker HC Sale price£71.35 Regular price£75.10
Save £1.54
Hanna Instruments-70300M pH Electrode Storage Solution, 230 mL
Hanna Instruments
Hanna Instruments-70300M pH Electrode Storage Solution, 230 mL Sale price£29.36 Regular price£30.90
Save £1.30
Hanna Instruments-700-11 Ammonia Checker calibration check set (0.00 and 1.00 ppm Ammonia)
Hanna Instruments
Hanna Instruments-700-11 Ammonia Checker calibration check set (0.00 and 1.00 ppm Ammonia) Sale price£24.70 Regular price£26.00
Save £1.67
Hanna Instruments-7007L pH 7.01 Buffer Solution, 500 mL bottle
Hanna Instruments
Hanna Instruments-7007L pH 7.01 Buffer Solution, 500 mL bottle Sale price£31.73 Regular price£33.40
Save £2.03
Hanna Instruments-7041S Electrolyte Solution for Polarographic Sensors
Hanna Instruments
Hanna Instruments-7041S Electrolyte Solution for Polarographic Sensors Sale price£38.67 Regular price£40.70
Save £2.03
Hanna Instruments-7042S Electrolyte Solution for Galvanic Sensors
Hanna Instruments
Hanna Instruments-7042S Electrolyte Solution for Galvanic Sensors Sale price£38.67 Regular price£40.70
Save £0.42
Hanna Instruments-701-25 Reagents for Hanna Instruments-701 Free Chlorine Pocket Checker
Hanna Instruments
Hanna Instruments-701-25 Reagents for Hanna Instruments-701 Free Chlorine Pocket Checker Sale price£7.98 Regular price£8.40
Save £1.51
Hanna Instruments-3833 Phosphate test kitHanna Instruments-3833 Phosphate test kit
Hanna Instruments
Hanna Instruments-3833 Phosphate test kit Sale price£28.79 Regular price£30.30
Save £18.47
Hanna Instruments-3817 General Water test kit
Hanna Instruments
Hanna Instruments-3817 General Water test kit Sale price£350.93 Regular price£369.40
Hanna Instruments-151-02 Checktemp4®folding thermometer, -50.0 to +150.0°CHanna Instruments-151-02 Checktemp4®folding thermometer, -50.0 to +150.0°C
Hanna Instruments
Hanna Instruments-151-02 Checktemp4®folding thermometer, -50.0 to +150.0°C Sale price£40.32
eXact Micro 20 w/ Bluetooth - Bulk
ITS
eXact Micro 20 w/ Bluetooth - Bulk Sale price£395.39

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