Portable Turbidity Meter – BST-TM40 and BST-TM20

Portable Turbidity Meter for Lab, Plant and Field

Turbidity checks happen in all kinds of places: a water treatment plant, a brewery, a swimming pool, a pharma line, a river bank. A meter that only works on a bench is not much use in most of them. Our portable turbidity meters are compact and rugged, so you can carry them to the sample instead of carrying the sample to the lab, and still get laboratory-grade readings.

We supply across India and to buyers in Asia, Africa and the Middle East. Price depends on the model and quantity and is shared on enquiry. Get turbidity meter price and specifications, or browse our other laboratory meters.

Key Features of Our Portable Turbidity Meter

• Compact, rugged construction that holds up in tough, outdoor conditions.
• Electrode method: you put the ZD700-S turbidity electrode straight into the sample, with no separate sample cuvette handling.
• Intelligent chip design with auto calibration, automatic zero setup and automatic range switching, so there is less to adjust by hand.
• Four display units: NTU, FTU, ASBC and EBC.
• Meets EPA 180.1 and ISO 7027 requirements for turbidity measurement.
• Data storage with time and date on both models.
• PC data transfer on the BST-TM40 through an RS-232 connection with software.
• CE marked models.

Portable Turbidity Meter Specifications

Please confirm the exact accessory set and certificate copies with our team when you place an enquiry.

What the Specifications Mean

What turbidity and NTU are. Turbidity is the cloudiness of a liquid caused by fine suspended particles such as silt, clay, algae or microorganisms. The meter shines light into the sample and measures how much is scattered. NTU, the Nephelometric Turbidity Unit, is the most common unit. If you want the science behind it, there is a good overview of turbidity.

Accuracy depends on the reading. The error is a percentage of what you are measuring, so it grows with the reading. For example, at 100 NTU the BST-TM40 and BST-TM20 are good to about ±2 NTU, and at 800 NTU to about ±24 NTU. For very clear water, the 0.01 NTU resolution lets you see small changes at the low end.

The four units. NTU and FTU are used for general water work. ASBC and EBC are brewing units, which is why these meters suit beer and beverage checks too.

EPA 180.1 and ISO 7027 are recognised turbidity methods for water. A meter that meets them gives readings that fit the way many labs, regulators and buyers expect turbidity to be reported.

IP54 and IP57. The first number covers dust and the second covers water. IP54 handles splashes. IP57 is rated for temporary immersion, so it is the safer pick if the meter will be used in wet field conditions.

How to Choose Between BST-TM40 and BST-TM20

Choose the BST-TM40 if your samples can get very cloudy (up to 4000 NTU), you want to store up to 999 readings, or you need to move data to a computer through RS-232. It runs from a DC 9 V adapter and comes with a flexible electrode holder and carrying case.

Choose the BST-TM20 if you need a light, battery-powered meter for field work, up to 2000 NTU. It has the higher IP57 rating and a portable case. Keep in mind it stores 200 readings and has no communication connector.

Not sure? Tell us the samples you test and the NTU range you expect, and we will recommend a model.

How to Take a Turbidity Reading

1. Switch on the meter and let the automatic zero setup finish.
2. Check calibration as described in the instruction manual. The meter calibrates automatically.
3. Choose the unit you need: NTU, FTU, ASBC or EBC.
4. Immerse the electrode in the sample, keeping it clear of the container walls and bottom, and let the reading settle.
5. Note the value or save it to memory, then rinse the electrode with clean water.

A small tip: air bubbles and scratches on the sensor window are the most common reasons for a wrong reading. Let bubbles clear, and keep the electrode clean and free of scratches.

Where Turbidity Meters Are Used

Why Choose Bionics Scientific?

Bionics Scientific has been making laboratory equipment for 26 years, and we operate as a unit of Kartal Projects Private Limited in Delhi. Both turbidity meter models are CE marked. We supply across India and to Asia, Africa and the Middle East, and our team helps with model selection, accessories, price, delivery and warranty details.

Turbidity Meter FAQs