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Turbidity Testing

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  1. Product Code: HI-93722-01 HI-93722-01 Cyanuric Acid Reagent, Turbidimetric Method
    £45.59 £37.99
  2. Product Code: PT 514 Palintest Turbidity Tube (13 inch)
    £58.92 £49.10
  3. Product Code: PT 513 Palintest Turbidity Tube (26 inch, 2-part)
    £88.00 £73.33
  4. Product Code: 56A010801 Lovibond Turbidity Tube
    £88.49 £73.74
  5. Product Code: HI-88703-11 HI-88703-11 Turbidity Calibration kit for HI-88703-02
    £242.45 £202.04
  6. Product Code: HTTURB HydroTest® Turbidity HTTURB
    £369.49 £307.91
  7. TurbiCheck Turbidity ifr Meter
    Product Code: 266020 Lovibond TurbiCheck TB 210 IR
    £696.50 £580.42
  8. Compact Turbimeter
    Product Code: PTH 090 Palintest Compact Turbimeter Plus
    £753.34 £627.78
  9. Product Code: HI-93703 HI-93703 Portable Turbidity Meter
    £859.07 £715.89
  10. Product Code: PTH 092 Palintest Turbimeter Plus Kit, Hard Case
    £867.29 £722.74
  11. Product Code: HI-93703C HI-93703C Portable Turbidity Meter kit
    £1,071.64 £893.03
  12. Product Code: HI-98703 HI-98703 Turbidity Meter
    £1,139.96 £949.97
  13. Product Code: HI-83749-02 HI-83749-02 Portable Turbidity Meter and bentonite monitoring
    £1,225.86 £1,021.55
  14. Compact Turbimeter/Ammonia + Meter Kit
    Product Code: PTH 7095 Palintest Compact Turbimeter/Ammonia + Meter Kit
    £1,326.10 £1,105.08
  15. Compact Turbimeter/ClO2+ Meter Kit
    Product Code: PTH 7093 Palintest Turbidity/TSS and Chlorine Dioxide Photometers
    £1,326.10 £1,105.08
  16. Compact Turbimeter/Chlorometer Kit
    Product Code: PTH 7091 Palintest Compact Turbimeter/Chlorometer Kit
    £1,326.10 £1,105.08
  17. Compact Turbimeter/Ozone Meter Kit
    Product Code: PTH 7094 Palintest Compact Turbimeter/Ozone Meter Kit
    £1,326.10 £1,105.08
  18. Compact Turbimeter/Chlorometer Duo Kit
    Product Code: PTH 7092 Palintest Compact Turbimeter/Chlorometer Duo Kit
    £1,367.45 £1,139.54
  19. Compact Turbimeter/Ammonia Duo Meter Kit
    Product Code: PTH 7096 Palintest Compact Turbimeter/Ammonia Duo Meter Kit
    £1,367.45 £1,139.54
  20. Product Code: HI-88713-02 HI-88713-02 ISO Turbidity Meter
    £1,866.00 £1,555.00
  21. Product Code: HI-88703-02 HI-88703-02 Bench Top Turbidity Meter, EPA Compliant
    £1,873.82 £1,561.52
  22. Product Code: HI-83414-02 HI-83414-02 Turbidity and Free and Total Chlorine Meter
    £2,107.94 £1,756.62

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Turbidity measurement


The term “turbidity” is used to describe the cloudy or milky appearance of liquid or solid media such as water (drinking, mineral, bathing or waste water), beverages (beer, wine or soft drinks) or window glass (translucent glass).


In physical terms, turbidity is due to particles of varying sizes scattering or absorbing light, giving the medium in question a cloudy appearance. This turbidity is caused by suspended particles such as sludge, limestone, yeast or microorganisms. 


It is still common practice to test water samples using a “sight tube” made of plastic; the tube is lowered into the water until a mark can no longer be seen. The turbidity is then calculated on the basis of immersion depth. Today, the phenomenon of turbidity is measured using optoelectronic meters. An artificial light source emits a known intensity of light through a sample.


The suspended particles scatter or absorb the light. The scattered light is then recorded on a photodetector. Nowadays, the scattered light is generally measured at an angle of 90°. This measurement principle is known as nephelometry. A nephelometer is therefore a turbidity meter that measures scattered light at an angle of 90°. To obtain defined, reproducible results, turbidity meters are calibrated and adjusted using formazine solutions (reference standard).


These meters display their results in FNUs (Formazine Nephelometric Units). The result measured by a meter operating on the transmitted light principle is shown in FAUs (Formazine Attenuation Units). There are two standards for turbidity measurement that are widely accepted at an international level.   EN ISO 7027, “Water quality, determination of turbidity” outlines all the possible methods for turbidity measurement.  All optoelectronic methods require an infrared light source. This also permits testing of coloured samples. In its method 180.1, “Determination of turbidity by nephelometry”, the EPA in the US describes solely the nephelometric (scatter light) method using a so-called white light source(tungsten halogen lamp). The results measured by different units using the two aforementioned methods cannot be compared.


Measuring the turbidity of swimming pool water would be a suitable and traceable way of making sure you comply with the PWTAG recommendations of 0.5NTU (Nephlometric Turbidity Units). The Lovibond® TB 210IR Turbidity meter offers a convenient, handheld and easy way of measuring turbidity to ensure you comply to these recommendations and offer a safe swimming environment.