The turbidity tube is designed to be a simple easy to
use device for measuring the clarity of water. It can
be used in the laboratory as well as for field
The turbidity tube is supplied as 2 clear plastic tubes,
each 30 mm in diameter x 300 mm long.
The tubes are pushed together, and a water sample is
slowly added. A measurement scale etched in black,
along the sides of the tubes provide a measure of
water clarity or turbidity.
• Easy to use
• Low cost
• Suitable for field use and laboratory
• Low weight - 100 gram (3.5 oz)
• Fast results
Turbidity is used as an indicator of the total amount of
material suspended in water.
Turbidity can indicate the presence of sediment that
has run off from construction sites, from logging sites,
mining operations, agricultural operations and
industrial discharges. It is also a factor in the suitability
of water for drinking and for irrigation purposes.
The more material that is suspended in water, the
greater is the water's turbidity and the lower its clarity.
Suspended material can be particles of clay, silt, sand,
algae, micro-organisms and other substances.
Turbidity affects how far light can penetrate into the
water. Natural (or background) turbidity levels in
waterways vary from <1 NTU in mountain streams, to
hundreds of NTU during rainfall or in naturally
turbid (muddy) waters.
In some situations, the colour of water can give a false
high turbidity, and if this is considered a problem, than
colour should be measured separately. This is often
the case where there is a high amount of organic
matter such as tannins in the water.