TURBIDITY METER Battery-operated portable turbidity meter with Tungsten lamp according to US EPA or infrared LED ( 860 nm) for nephelometric measurements according to ISO 7027 / DIN/ EN 27 027 ( EN ISO 7027) : Handy, lightweight and easy to operate. The AutoRange function switches the measuring range automatically. Resolutions are between 0.01 und 1 NTU, depending on the measuring range. The 1 to 3-point calibration is very convenient for the operator. Pressing the CAL key switches the instrument to the calibration mode. The menu-guided interface easily guides the operator through the calibration process: the operator is prompted to enter and confirm calibration standards in descending order. The Turb 355 T / IR comes in a handy carrying case. All necessary accessories are included. The instrument is powered by 4 AAA batteries and fulfills IP 67. Features: Measuring range     NTU FNU     0 … 1100 0 … 1100 Resolution     0.01 NTU from 1 … 9.99 0.1 NTU from 10.0 ... 99.9 1 NTU from 100 ... 1000