Product Selection Guide Start here for a general overview of each Xylem Analytics product family Multiparameter Sondes Water Quality Handhelds Current Profilers & Meters CTDs Data Collection Systems Samplers Velocity & Flow Meters Water Level Systems Survey & Floating Platforms Vertical Profilers Online Instruments Benchtop Water Quality Biochemistry Analyzers Colorimeters & Photometers Hot Plates & Stirrers Refractometers & Polarimeters Temperature & Data Loggers Titrators Viscometers