There are four kinds of ion concentration measuring units: pX, mol/L, mg/L and ppm; Two kinds of calibration solution can be self-setup to directly test the ion concentration of sample solution. mode for high purified water and ammonia added purified water can be setup, suitable for use in electric power and petrifaction industry. The Meter inside is provided with ten kinds of ions modes that can be selected, further it also have the capability to self-define other ions. TECHNOCRACY PVT. LTD.