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.

Filters

Sort by:

4196 products

Save £13.68
Hanna Instruments-9814 Groline Hydroponic Portable pH/EC/TDS/Temperature MeterHanna Instruments-9814 Groline Hydroponic Portable pH/EC/TDS/Temperature Meter
Hanna Instruments
Hanna Instruments-9814 Groline Hydroponic Portable pH/EC/TDS/Temperature Meter Sale price£259.92 Regular price£273.60
Save £17.01
Hanna Instruments-96831 Digital Refractometer for Ethylene Glycol Analysis
Hanna Instruments
Hanna Instruments-96831 Digital Refractometer for Ethylene Glycol Analysis Sale price£323.29 Regular price£340.30
Save £10.78
Hanna Instruments-98131 GroLine Hydroponic Waterproof Pocket pH/EC/TDS/Temperature Tester
Hanna Instruments
Hanna Instruments-98131 GroLine Hydroponic Waterproof Pocket pH/EC/TDS/Temperature Tester Sale price£204.92 Regular price£215.70
Save £10.24
Hanna Instruments-935005 K-type Thermometer
Hanna Instruments
Hanna Instruments-935005 K-type Thermometer Sale price£194.56 Regular price£204.80
Save £1.67
Hanna Instruments-93711-01 Total Chlorine Reagent, DPD MethodHanna Instruments-93711-01 Total Chlorine Reagent, DPD Method
Hanna Instruments
Hanna Instruments-93711-01 Total Chlorine Reagent, DPD Method Sale price£31.83 Regular price£33.50
Save £0.78
Hanna Instruments-93755-53 Chlorine remover reagent for Hanna checker Hanna Instruments-775
Hanna Instruments
Hanna Instruments-93755-53 Chlorine remover reagent for Hanna checker Hanna Instruments-775 Sale price£14.92 Regular price£15.70
Save £5.63
Hanna Instruments-935007N Portable Thermometer with Fixed K-Type Probe
Hanna Instruments
Hanna Instruments-935007N Portable Thermometer with Fixed K-Type Probe Sale price£106.97 Regular price£112.60
Save £4.90
Hanna Instruments-93718-03 Reagents for 300 iodine tests for Hanna Instruments-93718
Hanna Instruments
Hanna Instruments-93718-03 Reagents for 300 iodine tests for Hanna Instruments-93718 Sale price£93.10 Regular price£98.00
Save £1.92
Hanna Instruments-93703-50 Cuvette Cleaning Solution, 230ml
Hanna Instruments
Hanna Instruments-93703-50 Cuvette Cleaning Solution, 230ml Sale price£36.48 Regular price£38.40
Save £41.73
Hanna Instruments-9147-10 Dissolved Oxgen Meter for Fish Farming, 10m Probe
Hanna Instruments
Hanna Instruments-9147-10 Dissolved Oxgen Meter for Fish Farming, 10m Probe Sale price£792.97 Regular price£834.70
Save £78.41
Hanna Instruments-83300-02 Multi-parameter Benchtop Photometer & pH meter
Hanna Instruments
Hanna Instruments-83300-02 Multi-parameter Benchtop Photometer & pH meter Sale price£1,489.89 Regular price£1,568.30
Save £4.18
Hanna Instruments-720 Calcium Hardness Handheld Colorimeter - Checker HCHanna Instruments-720 Calcium Hardness Handheld Colorimeter - Checker HC
Hanna Instruments
Hanna Instruments-720 Calcium Hardness Handheld Colorimeter - Checker HC Sale price£79.42 Regular price£83.60
Save £4.51
Hanna Instruments-719 Magnesium Hardness Handheld Colorimeter - Checker®HC
Hanna Instruments
Hanna Instruments-719 Magnesium Hardness Handheld Colorimeter - Checker®HC Sale price£85.69 Regular price£90.20
Save £4.51
Hanna Instruments-709 Manganese High Range Handheld Colorimeter - Checker®HC
Hanna Instruments
Hanna Instruments-709 Manganese High Range Handheld Colorimeter - Checker®HC Sale price£85.69 Regular price£90.20
Save £0.74
Hanna Instruments-740200 pH electrode storage cap with compression fitting (5 pack)
Hanna Instruments
Hanna Instruments-740200 pH electrode storage cap with compression fitting (5 pack) Sale price£14.06 Regular price£14.80
Save £0.70
Hanna Instruments-747-25 Reagents for Hanna Instruments-747 Copper Low Range Checker®HC
Hanna Instruments
Hanna Instruments-747-25 Reagents for Hanna Instruments-747 Copper Low Range Checker®HC Sale price£13.30 Regular price£14.00
Save £1.82
Hanna Instruments-710027 Blue shockproof rubber boot
Hanna Instruments
Hanna Instruments-710027 Blue shockproof rubber boot Sale price£34.68 Regular price£36.50
Save £1.43
Hanna Instruments-749-11 Calibration Check Set for the Hanna Instruments-749 Chromium Low Range Checker®HC
Hanna Instruments
Hanna Instruments-749-11 Calibration Check Set for the Hanna Instruments-749 Chromium Low Range Checker®HC Sale price£27.27 Regular price£28.70
Save £3.54
Hanna Instruments-7634-00 Conductivity/TDS Probe
Hanna Instruments
Hanna Instruments-7634-00 Conductivity/TDS Probe Sale price£67.36 Regular price£70.90
Save £3.75
Hanna Instruments-758 Marine Calcium Handheld Colorimeter - Checker®HCHanna Instruments-758 Marine Calcium Handheld Colorimeter - Checker®HC
Hanna Instruments
Hanna Instruments-758 Marine Calcium Handheld Colorimeter - Checker®HC Sale price£71.35 Regular price£75.10
Save £1.72
Hanna Instruments-7033L 84uS/cm Conductivity Calibration Solution, 500mL
Hanna Instruments
Hanna Instruments-7033L 84uS/cm Conductivity Calibration Solution, 500mL Sale price£32.68 Regular price£34.40
Save £1.72
Hanna Instruments-7030L Conductivity Calibration Solution 12880uS/cm , 500 mL
Hanna Instruments
Hanna Instruments-7030L Conductivity Calibration Solution 12880uS/cm , 500 mL Sale price£32.68 Regular price£34.40
Save £1.72
Hanna Instruments-7031L 1413uS/cm Conductivity Calibration Solution, 500mL
Hanna Instruments
Hanna Instruments-7031L 1413uS/cm Conductivity Calibration Solution, 500mL Sale price£32.68 Regular price£34.40
Save £1.02
Hanna Instruments-70442M 1500 mg/L (ppm) TDS Calibration Solution, 250mL bottle
Hanna Instruments
Hanna Instruments-70442M 1500 mg/L (ppm) TDS Calibration Solution, 250mL bottle Sale price£19.38 Regular price£20.40

International Delivery

For small orders & export tenders

12,000+ PRODUCTS

From the Market Leaders

Support & Trade Accounts

Contact Us for Support & Trade Accounts

Secure payments

Online payments securely administed by Shopify