Specification Brand : Milwaukee BulletPoint1 : Atc connector: tinned ends BulletPoint2 : Atc element: 100Pt rtd BulletPoint3 : Connector: bnc BulletPoint4 : Country of origin: United States ExternallyAssignedProductIdentifier1 : 0810666001668 ExternallyAssignedProductIdentifier2 : 810666001668 ItemName : 0/cs EC66 Waterproof Tester ItemPackageDimensions_Height : 27.432 centimeters ItemPackageDimensions_Length : 5.08 centimeters ItemPackageDimensions_Width : 10.414 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : science-lab-ph-meters Manufacturer : Cole-Parmer Material : Epoxy ModelNumber : AO-27301-23 NumberOfItems : 1 PackageLevel : unit PartNumber : AO-27301-23 ProductDescription : The Milwaukee Conductivity Pen is designed for hydroponic and other growers to help you make sure that your plants are receiving the right amount of nutrient. Keep EC in your target range to help your achieve better results. DESIGN FEATURES Measures conductivity and temperature with automatic temperature compensation. Ideal range for hydroponics (0.00 to 10.00 mS/cm). Units in mS/cm easily convertable to ppm. Factory calibrated with the ability to recalibrate if needed. Replaceable electrode. Fully waterproof to IP65. 250 hours continuous use (3 x 1.5V batteries included). CARE AND USE MAINTENANCE EC electrodes can develop nutrient build up over time. To miminize build up, always rinse the probe in fresh tap water after every use. CONVERTING EC TO TDS The Milwaukee EC Pen, like all conductivity meters, provides a measure of electrically charged ions in a solution and is an absolute measure of conductivity. EC is often converted to TDS in parts per million (ppm). Different scales include the 500 scale, 650 scale and the 700 scale. However, true PPM can only be determined through chemical analysis. Your mS/cm reading can be approximately converted to TDS (ppm) as shown in the examples below. 2.00 mS/cm = 2000 uS/cm = 1000 ppm on .50 factor scale 2.00 mS/cm = 2000 uS/cm = 1400 ppm on the 442 scale or .70 factor scale ProductSiteLaunchDate : 2016-01-29T22:13:39.150Z StreetDate : 2017-05-15T00:00:01Z SupplierDeclaredDgHzRegulation : unknown UnitCount : 1 UnspscCode : 43000000