Measurement of dissolved oxygen, O2 concentraion in mg / l, conductivity, TDS, pH, Redox and temperature. The SensoDirect 150 combines the features of several electrochemistry meters. It is designed for multi purpose operation and measures pH / Redox / dissolved oxygen and conductivity / TDS. The AL15 incorporates an intuitive user interface, large, easy to read display and is supplied with a sturdy handy case with electrodes, buffer solution and accessories. Measurement of dissolved oxygen, O2 concentraion in mg / l, conductivity, TDS, pH, Redox and temperature. The SensoDirect 150 combines the features of several electrochemistry meters. It is designed for multi purpose operation and measures pH / Redox / dissolved oxygen and conductivity / TDS. The AL15 incorporates an intuitive user interface, large, easy to read display and is supplied with a sturdy handy case with electrodes, buffer solution and accessories.