pH Solution & Electrodes

Make sure you've got all the tools needed for pH meter calibration and safe storage with our selection of pH solutions, including buffer solutions. We also stock a range of replacement pH electrodes for when electrodes are damaged or degraded. Read More about pH Solution & Electrodes
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35 Products
  1. ETI 816-051 pH Buffer Solution: 7.00 pH
    ETI logo
    2 In Stock
    ETI 816-051 pH Buffer Solution: 7.00 pH
    (no reviews)
    £11.76 £9.80
    • Buffer solution rated to 7.00pH
    • Used for calibrating pH meters
    • 100ml per bottle
    9 Reward Points
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    816-051
  2. Extech EX006 Weighted Base and Solution Cups Kit
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    Extech EX006 Weighted Base and Solution Cups Kit
    (no reviews)
    £15.11 £12.59
    12 Reward Points
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    EX006
  3. Extech EX007 Spare Sample Solution Cups (24pk)
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    Lead Time: 1-6 Days
    Extech EX007 Spare Sample Solution Cups (24pk)
    (no reviews)
    Discontinued
    View product for alternatives.
    EX007
  4. Extech PH113 Filling Solution Kit
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    Extech PH113 Filling Solution Kit
    (1)
    Discontinued
    View product for alternatives.
    PH113
  5. Extech CL203 ExTab Reagent Tablets (10pk, 100 Tests)
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    Extech CL203 ExTab Reagent Tablets (10pk, 100 Tests)
    (no reviews)
    £18.60 £15.50
    15 Reward Points
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    CL203
  6. Extech BTL10 Test Bottles
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    Extech BTL10 Test Bottles
    (no reviews)
    Discontinued
    • 2 x test bottles included
    • For use with Extech CL500 and TB400
    • Direct replacement for bottles included with these meters
    View product for alternatives.
    BTL10
  7. Extech PH4 P 4pH Buffer Solution (2 Bottles)
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    Only 1 In Stock
    Extech PH4 P 4pH Buffer Solution (2 Bottles)
    (1)
    £23.99 £19.99
    19 Reward Points
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    PH4-P
  8. Extech EC 12880 P 12880 Micro S Conductivity Standard (2 Bottles)
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    Only 1 In Stock
    Extech EC 12880 P 12880 Micro S Conductivity Standard (2 Bottles)
    (no reviews)
    £25.14 £20.95
    20 Reward Points
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    EC-12880-P
  9. Extech EC 1413 P 1413 Degrees S Conductivity Standard (2 Bottles)
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    Only 1 In Stock
    Extech EC 1413 P 1413 Degrees S Conductivity Standard (2 Bottles)
    (no reviews)
    £25.14 £20.95
    20 Reward Points
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    EC-1413-P
  10. Extech EC 84 P 84 Degrees S Conductivity Standard (2 Bottles)
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    Extech EC 84 P 84 Degrees S Conductivity Standard (2 Bottles)
    (no reviews)
    £25.14 £20.95
    20 Reward Points
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    EC-84-P
  11. Extech PH7 P 7pH Buffer Solution (2 Bottles)
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    Only 1 In Stock
    Extech PH7 P 7pH Buffer Solution (2 Bottles)
    (no reviews)
    £25.14 £20.95
    20 Reward Points
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    PH7-P
  12. Extech PH105  Replacement pH Electrode Module
    Extech logo
    3 In Stock
    Extech PH105 Replacement pH Electrode Module
    (2)
    £30.00 £25.00
    25 Reward Points
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    PH105
  13. Extech PH10 P 10pH Buffer Solution (2 Bottles)
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    Only 1 In Stock
    Extech PH10 P 10pH Buffer Solution (2 Bottles)
    (1)
    £30.00 £25.00
    25 Reward Points
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    PH10-P
  14. Extech PH103 Tripak Buffer Pouches (4 7 and 10pH plus Rinse Solution)
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    Extech PH103 Tripak Buffer Pouches (4 7 and 10pH plus Rinse Solution)
    (1)
    £33.60 £28.00
    28 Reward Points
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    PH103
  15. Extech 601500 Standard pH Electrode (12 x 160mm)
    Extech logo
    3 In Stock
    Extech 601500 Standard pH Electrode (12 x 160mm)
    (3)
    £35.99 £29.99
    29 Reward Points
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    601500
  16. ETI 170-100 Temperature Probe (8100 Plus)
    ETI logo
    2 In Stock
    ETI 170-100 Temperature Probe (8100 Plus)
    (no reviews)
    £38.40 £32.00
    • Replacement probe for 8100 Plus pH kit
    • Lumberg connector
    • 1m lead
    32 Reward Points
    Price Match Guarantee
    170-100
  17. Extech EC405  Replacement Conductivity Cell Module
    Extech logo
    Extech EC405 Replacement Conductivity Cell Module
    (no reviews)
    £45.11 £37.59
    37 Reward Points
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    EC405
  18. Extech RE305  Replacement ORP Electrode Module
    Extech logo
    Lead Time: 1-2 Weeks
    Extech RE305 Replacement ORP Electrode Module
    (no reviews)
    £45.23 £37.69
    37 Reward Points
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    RE305
  19. Extech 60120B Mini pH Electrode (10x120mm)
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    Lead Time: 1-2 Weeks
    Extech 60120B Mini pH Electrode (10x120mm)
    (no reviews)
    £46.80 £39.00
    39 Reward Points
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    60120B
  20. Extech EX010  3ft Extension Cable with Probe Guard/Weight
    Extech logo
    Lead Time: 1-2 Weeks
    Extech EX010 3ft Extension Cable with Probe Guard/Weight
    (no reviews)
    £47.99 £39.99
    39 Reward Points
    Price Match Guarantee
    EX010
  21. Extech 6015WC Waterproof Palm pH Electrode
    Extech logo
    5 In Stock
    Extech 6015WC Waterproof Palm pH Electrode
    (no reviews)
    £51.00 £42.50
    42 Reward Points
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    6015WC
  22. Extech PH115  Replacement Refillable pH Electrode Module
    Extech logo
    Extech PH115 Replacement Refillable pH Electrode Module
    (no reviews)
    £52.08 £43.40
    43 Reward Points
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    PH115
  23. Extech CL207 Chlorine Standard
    Extech logo
    Extech CL207 Chlorine Standard
    (no reviews)
    £54.00 £45.00
    45 Reward Points
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    CL207
  24. Extech DO603 Membrane Kit
    Extech logo
    Only 1 In Stock
    Extech DO603 Membrane Kit
    (no reviews)
    £54.00 £45.00
    45 Reward Points
    Price Match Guarantee
    DO603

Showing 1 - 24 of 35 products

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About pH Solution & Electrodes

When using a pH meter it is incredibly important to maintain the device's electrode via the use of buffer solutions. Not doing so will lead to the efficiency of the electrode deteriorating at a much quicker rate, leading to it having to be replaced more often.

It is also common practice to perform pH meter calibration before each testing procedure - this enables the user to check that the electrode is functioning correctly and that the result gained during the real testing procedure will be accurate. Not doing so can be a significant danger, as an incorrect reading taken using an uncalibrated could leave the target substance with high acid/alkali levels that shouldn't be present.

Sample pH solutions are used commonly during these calibration procedures to check that the tester is working correctly. Before this is done the probe of the pH meter should be thoroughly rinsed using a special rinse solution, and then it should be immersed into the sample solution, stirring gently to create a homogenous sample. The reading should then be accurate to the solution used and if so, the meter is calibrated correctly.

Sample pH solutions are often referred to as buffer solutions, and they are designed to resist sudden changes in pH, making them perfect for calibration purposes. The buffer solution can differ in pH, so choosing the right one for your testing needs is important. There are also buffer solutions created for specific pH types, such as chlorine.

It is also good practice to rinse electrodes before testing actual solutions as well - not doing so could lead to contamination and inaccurate readings being taken.