TN400 Portable Turbidity Meter Kit


The Apera Instruments TN400 Portable Turbidity Meter is equipped with an infrared light source, and a large TFT colored screen, designed for reliable turbidity measurements from 0 to 1000 NTU in various applications both in-field and in-lab e.g. beverage making, environmental monitoring, drinking water analysis, etc.

  • Large Colored TFT display with graphic and text guides, Accuracy: ±1% or 0.02 NTU, whichever is greater
  • Accurate and reliable turbidity measuring performance
  • Easy and quick calibration
  • TFT Colored Screen (measurement mode, green in calibration) with graphic and text operation guides
  • U.S. EPA certified, non-toxic, easy-to-use AMCO Clear ® polymer standard solutions
  • CE certified and comes with 2-Year Warranty

The test kit comes with 4 kinds of AMCO Clear ® high-molecular polymer turbidity standard solutions (0.02 NTU, 20.0 NTU, 100 NTU, 800 NTU). AMCO Clear® is an EPA approved primary standard for calibration of turbidity sensors that is safe, non-toxic and disposable. It is NIST traceable to particle size/distribution and optical density, and its inherent stability means it does not settle from suspension.

The standards have a guaranteed one-year shelf life even if you've opened the bottle and happened not to have recapped it tightly. The convenient submicron polymer suspensions are non-toxic primary calibration standards approved by the US EPA for drinking water analysis for turbidity.


Measuring Method

ISO 7027 compliant nephelometric method (90 °)

Measuring Range

0 to 1000 NTU, automatic range selection:

0.01 to 19.99 NTU

20.0 to 99.9 NTU

100 to 1000 NTU


0.01/0.1/1 NTU

Reading Error

≤ ±2 % of reading ± stray light


≤ ±1 % of reading or 0.02 NTU, whichever is greater

Calibration Standards

0.02 NTU, 20.0 NTU, 100 NTU, 800 NTU(Polymer)

Light Source

Infrared light emitting diode (850 nm)


Silicon- photovoltaic

Sample Vials

Φ25×60 mm, high borosilicate glass with screw cap

Sample Volume

18 ml

Operating Temperature

0 to 50 ˚C

Power Supply

4× AA Batteries

IP Rating



90 × 203 × 80 mm
(with carrying case 310 × 295 × 110 mm)


385 g (with carrying case 1.5 kg)


ISO9001:2008 & CE


  • TN400
  • Calibration Solutions (0.02 NTU, 20.0 NTU, 100 NTU, 800 NTU)
  • 3 Sample Vials
  • Silicone Oil
  • Carrying Case

The meter is CE certified and comes with a 2-year warranty.

Deutsch Manual (TN400_DE_2018.pdf, 1,568 Kb) [Download]

English Manual (TN400_EN_2018.pdf, 1,460 Kb) [Download]

Standard Calibration Solution Set for Apera Instruments TN400 Portable Turbidity Meter . AMCO Clear ® turbidity standard solutions (0.02 NTU, 20.0...

Replacement sample vials with caps for use with Apera turbidity meters. Pack of 3.

The TN400-S3 Silicone Oil is for cleaning the sample vials and standard solution vials of turbidity test.