Product - Turbidity

About Turbidity  

Turbid water

Turbidity can be interpreted as a measure of the relative clarity of water. Turbidity is not a direct measure of suspended particles in water but, instead, a measure of the scattering effect such particles have on light. See more about the science of turbidity

Today, many methods exist for the determination of water contaminants, yet turbidity measurement is still important because it is a simple and undeniable indicator of water quality change. A sudden change in turbidity may indicate an additional pollution source (biological, organic or inorganic) or may signal a problem in the water treatment process.

In practical applications significant problems can introduce interference and errors that reduce the accuracy of any instrument. To ensure the instrument is operating properly and providing the most accurate answers possible, it is important to verify its calibration. See more about standards and calibration

Product Spotlight  

Verification Quick Check for the FT660 sc - Hach

Hach Verification Quick Check – the NEW Standard!

Hach’s Verification Quick Check (VQC) is a dry secondary standard for the FilterTrak 660 (FT660) sc laser nephelometer that enables calibration verification in 20 seconds – saving you time and money. The FT660 measures ultra low levels of turbidity and has the lowest limit of detection on the market.

The VQC is compatible with previously purchased FT660 models.

Key Products  

Online Instrumentation
comparison guide

Ultra Low Range

FILTERTRAK 660 Laser Nephelometer with sc200 Controller, 24VDC, 2 Channel

FILTERTRAK 660 Laser Nephelometer
Detects changes in turbidity as low as 0.0005 NTU. Meets all USEPA filtering monitoring requirements.

Low Range

1720E Turbidimeter with sc200 Controller, 1 Channel

1720E Process Turbidimeter
Meets and exceeds USEPA Method 180.1 for measuring turbidity for drinking water compliance. Sensitive to fine changes in low level turbidity with a built-in bubble removal system.

High Range

Surface Scatter® 7 sc Turbidimeter with sc200 Controller Standard 2 Channel

Surface Scatter® 7
Measures a turbidity range from 0 to 9999 NTU.


SOLITAX sc PVC Wiper with sc200 Controller

SOLITAX Turbidity
Includes a sc200 Controller and PVC t-line sc Turbidity Sensor (0.001 to 4000 NTU) with wiper.

Laboratory / Portable Products


2100Q Portable Turbidimeter

2100Q Portable Turbidimeter
Unsurpassed ease of use and accuracy. Compliant with USEPA Method 180.1 design criteria.


2100N Laboratory Turbidimeter, EPA, 115 Vac

2100N Laboratory Turbidimeter
Equipped with a stable halogen-filled tungsten filament lamp to meet the reporting requirements of EPA Method 180.1. This model is ideal for basic laboratory testing of samples up to 4000 NTU.



Gelex Secondary Turbidity Standards Kit, 2100AN

Turbidity Standards
Bulk Standard, Gelex Secondary Standards, StablCal Calibration Kits, Gelex Secondary Turbidity Kits available.

USEPA accepted for calibration purposes. StablCal® Stabilized Formazin Turbidity Standards are true Formazin dilutions developed for use in any turbidimeter.