Instruction Manual

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1 OVERVIEW
Thank you for purchasing Apera Instruments TN400 Portable Turbidity Meter (hereafter
referred to as the instrument).
The instrument uses infrared light emitting diode (LED 860±30nm) as the light source and 90°
scattering method, which is compliant with ISO 7027 and DIN EN 27027 standards for the
determination of turbidity for water solutions. TN400 allows you to measure turbidity in a reliable and
simple manner wherever you are.
Main features and functions
⚫ Large TFT color screen with clear on-screen instructions for easy operation.
⚫ Average measurement mode automatically takes 10 sets of readings consecutively and
display the average. It improves the accuracy of the measurement, especially suitable for
sample solutions with rapid settling and continuous measurement changes.
⚫ U.S. EPA certified, non-toxic, easy-to-use polymer standard calibration solutions
⚫ Rugged design, suitable for use in harsh environments.
⚫ Everything comes in a carrying case, including accessories such as calibration solutions,
sample vials, and more.