Turbidity Meter

Apera TN400 Portable Turbidity Meter

A sophisticated instrument designed for accurate and convenient turbidity measurements is the Apera TN400 Portable Turbidity Meter. Here are some key features:

  1. Large Colored TFT Display: The meter is equipped with a large colored TFT display, providing clear measurement information. The display includes graphic and text guides for easy operation.
  2. Accuracy: The device offers high accuracy, with a precision of ±1% or 0.02 NTU (Nephelometric Turbidity Units), whichever is greater. This ensures reliable and precise turbidity readings.
  3. Infrared Light Source: The meter utilizes an infrared light source, adhering to the ISO7027 standard for turbidity measurement.
  4. Easy and Quick Calibration: The setup process is streamlined for users, making calibration easy and quick.
  5. TFT Colored Screen: The colored screen is not only visually appealing but also provides clear indications in different modes. In calibration mode, the screen appears green.
  6. U.S. EPA Certified: The meter is U.S. EPA certified, meeting regulatory standards for environmental monitoring. It utilizes non-toxic and easy-to-use polymer standard solutions for calibration.
  7. CE Certified: The device is CE certified, indicating compliance with European safety and environmental requirements.
  8. 2-Year Warranty: The meter comes with a 2-year warranty, providing assurance of its durability and reliability over an extended period.


The portable turbidity meter from Apera TN400 is engineered with advanced features to ensure reliable measurements of turbidity across various applications. Here are the key highlights:

  1. Infrared Light Source: The meter is built with an infrared light source, adhering to the ISO7027-compliant nephelometric method (90°). This method is widely recognized for its accuracy and reliability in turbidity measurements.
  2. Large TFT Colored Screen: The meter is equipped with a large TFT colored screen, enhancing visibility and providing a user-friendly interface for clear and efficient operation.
  3. Wide Measurement Range: The TN400 is designed to deliver reliable turbidity measurements across a broad range, from 0 to 1000 NTU (Nephelometric Turbidity Units). This wide measurement range makes it suitable for diverse applications.
  4. Versatile Applications: The meter is versatile and applicable in various settings, including environmental monitoring, water treatment processes, beverage production, and more. Its portability allows for both in-field and in-lab use.
  5. Precision and Accuracy: With adherence to ISO7027 standards, the meter offers precise and accurate turbidity measurements, ensuring data reliability for critical applications.

Calibration Range
The test kit is supplied with four vials of high-molecular polymer turbidity standard solutions, providing a comprehensive calibration range:

  1. 0.02 NTU: A low concentration standard for precise calibration at the lower end of the turbidity scale.
  2. 20.0 NTU: An intermediate concentration standard suitable for mid-range calibration.
  3. 100 NTU: A higher concentration standard for calibration in the upper range of turbidity measurements.
  4. 800 NTU: A very high concentration standard for calibrating turbidity sensors at the extreme upper end of the scale.

Key features of these standards include:

  • EPA Approved. The standards are approved by the U.S. Environmental Protection Agency (EPA) as primary calibration standards for turbidity sensors used in drinking water analysis.
  • Safe and Non-Toxic. The solutions, which are high-molecular polymer turbidities, ensure health and safety standards by being safe and non-toxic.
  • Disposable. The standards are disposable, eliminating the need for complex handling and storage procedures.
  • NIST Traceable. The standards are NIST (National Institute of Standards and Technology) traceable, providing a reliable reference for particle size/distribution and optical density.
  • Inherent Stability. The standards exhibit inherent stability, preventing settling from suspension and maintaining accuracy over time.
  • Extended Shelf Life. The one-year shelf life of the standards is guaranteed, allowing flexibility in usage even if a bottle is not recapped tightly after opening.

These high-quality turbidity standards make calibration processes convenient, reliable, and compliant with regulatory standards, making them an essential component of the turbidity test kit.


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