Free chlorine and turbidity meters for water treatment operators
By Sadguru Research & Analysis Laboratory · 23 October 2026
Colour-matching kits leave a lot to the eye. If you run a housing society water system, a swimming pool, a packaged water plant or a food factory, digital chlorine and turbidity readings make daily checks objective and easy to record.
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Free chlorine: the DPD colorimeter
Where water is chlorinated, IS 10500 asks for at least 0.2 mg/l free residual chlorine at the consumer tap. A handheld DPD colorimeter gives a digital reading in a minute.
Hanna HI701 Checker HC Free Chlorine Colorimeter
Digital free-chlorine readings for water tanks, pools, food plants and housing societies, without guessing colours.
Lab note: IS 10500 asks for at least 0.2 mg/l free residual chlorine at the tap where water is chlorinated.
Check price on AmazonTurbidity: clarity you can measure
IS 10500 sets 1 NTU as acceptable and 5 NTU as the maximum permissible turbidity. High turbidity shields bacteria from chlorine and UV. A portable turbidity meter shows filter breakthrough before it becomes visible.
Apera TN400 Portable Turbidity Meter
Measures turbidity of drinking and process water; useful for packaged water plants and treatment operators.
Lab note: IS 10500 sets 1 NTU acceptable (5 NTU permissible). Use clean, scratch-free sample vials.
Imported listing: check the plug type and voltage (India uses 230 V) before ordering.
Check price on AmazonKeep a log
Record chlorine and turbidity at fixed points and times every day. Inspectors and auditors value a consistent log more than a single good reading.
Common questions
Total chlorine or free chlorine?
Free chlorine is the disinfecting part and the one IS 10500 refers to. Measure free chlorine for drinking water.
Do these replace lab testing?
No. They are for daily control. Periodic lab tests are still needed for bacteria and the full IS 10500 panel.
Test before you spend
A laboratory report tells you exactly what your water or food needs, so you buy the right equipment once. We test water to IS 10500 and food to FSSAI standards, with sample pickup across Kolkata.