Avoid the hassle by avoiding titrations with our easy to use colorimetric Hardness Chemkey. The Hach SL1000 Portable Parallel Analyser (PPA) performs the same tests with less than half the manual steps. Get highly accurate results, with less opportunity for errors, in a fraction of the time. Up to six parameters, tested in parallel. The SL1000 is a portable colorimeter that provides faster testing by using Chemkey reagents instead of powder pillows. All chemicals and processes are entirely contained inside the Chemkey. Low Range Hardness Chemkeys, range 3 - 100 mg/L CaCO3. For SL1000 Portable Parallel Analyser (PPA).