Good Water Warehouse, of Fullerton, Calif., introduces the OAKTON Instruments’ portable meters with multi-point, push-button calibration functions for exceptionally high accuracy, resolution and repeatability. They measure conductivity up to five ranges from 0.00 to 19.99 uS resolution, 0.0 to 199.9 uS with 0.1 uS resolution, 0 to 1,999 uS with 1 uS resolution, 0 to 19.99 mS with 0.01 mS resolution and 0 to 199.9 mS with 0.1 mS resolution. They measure total dissolved solids up to six ranges from 0.00 to 9.99 ppm with 0.01 ppm resolution.