Hydroscopio SA  distributes chemical liquids suitable for use for calibration of water quality sensors.
pH buffers, ammnonium and nitrate standards, conductivity, redox, turbidity buffer solutions are some of the material available. There is possibility to order buffers in order to calibrate a sensor to a specific value.

Also, special orders can be made for chemicals suitable for use in water disinfection, such as sodium hypochlorite solution (NaClO), which can be delivered in tanks and used with the automatic chlorination systems available.