The Oakton T-100 series portable turbidity meters feature five calibration points—0 NTU, 20 NTU, 100 NTU, 400 NTU, and 800 NTU. The 0 NTU uses laboratory distilled or deionized water, while the other four calibration points are configured using high molecule polymer standard solutions included in the kits. The meters also include normal and continuous measurement modes, parameter setup, data recall, real-time clock, calibration date check, automatic power off, and low voltage indication. The continuous measure mode allows you to automatically generate average, maximum and minimum measured values in a data storage interface, suitable for sample solutions with rapid settling and continuous measurement changes. The large TFT color screen displays a blue background for measurement mode, green background for calibration mode, and features operation guides for easy calibration and measurement. Up to 200 sets of data can be stored on the meter. A USB interface cable can transfer this data to your computer for future analysis.