Just four buttons on the Hach Pocket Colorimeter II allow easy operation. The Read/Enter key is used when measuring sample concentrations or to confirm menu choices. The Menu key provides quick menu navigation and selection. Use the Zero/Scroll key to zero the instrument or to scroll through menu options. The Power/Backlight key turns the instrument on and toggles the display backlight for low light conditions.

The IP67 rating means the Pocket Colorimeter II will resist the elements and still function properly. A tough, impactresistant shell protects the electronics and optics. It weighs only 0.2 kg—about a half pound. A lanyard keeps the cap attached to the colorimeter.

The Range Indicator icon on the display of the colorimeter indicates either the instrument range or the parameter being tested. For many parameters, the instrument can measure in two different ranges. The battery icon will indicate when the batteries need to be replaced. The instrument logs the ten most recent data points and the time the measurements were made—no need to record results manually.

The Pocket Colorimeter II offers accuracy and reproducibility comparable to expensive lab instruments, but is designed for a long working life in harsh conditions. A long-lasting LED is used as the light source, and low power requirements assure long battery life.

The instruments are factory programmed for one or two of more than 30 parameters. Many are based on EPAapproved methods. No manual calibration is ever required. Simply zero the instrument with a blank, insert the reacted sample, and read the result. Wavelength-specific models without factory calibration are also available for programming custom methods.

The higher absorbance range provided by the improved quality of the optical system over the previous model provides expanded ranges for several parameters— reducing the need for dilutions.