HANNA CONDUCTIVITY METER (HI98311) Keeping the water clean is the #1 maintenance tip you should follow. You want to keep the purity of the water within the manufacturers recommended conductivity levels, measured in micro-Siemens (μS), to prevent corrosion of the valuable copper and aluminum components in your laser. Measuring the conductivity of your chiller water is quick and easy with the Hanna HI98311 meter. Simply turn on the meter, insert the probe end into the water and view the reading on the LCD display. It’s that simple! The lower the conductivity reading, the better your water quality is! • EC range of 0 to 3999 uS/cm at a 1 uS/cm resolution within an accuracy (@ 20°C/68°F) of +/-2% Full Scale • TDS range of 0 to 2000 ppm at a 1 ppm resolution within an accuracy (@ 20°C/68°F) +/-2% of Full Scale • Temperature range of 0.0 to 60.0 °C or 32.0 to 140.0 °F at 0.1 °C or 0.1 °F resolution within an accuracy (@ 20C/68°F) +/-0.5 °C or +/-1 °F • EC / TDS Calibration; Automatic 1 point at 1413 uS/cm • Includes 4 x 1.5V batteries with 100 hours rated life • Auto Shut-off after 8 minutes • Battery Operated: 4 x 1.5V / 100 Hours This waterproof tester has a dual-level LCD that displays EC or TDS and °C or °F. At startup, DiST performs a self check and then displays the remaining battery level to assure proper working condition. It also features a stability indicator and hold feature to prompt the user when to take the reading. The stainless steel temperature probe makes for faster and more precise temperature measurement. Calibration and temperature compensation is automatic. The graphite electrode provides the greatest possible accuracy as it cannot be contaminated by salt deposits in the solution!