Pocket-size device for measuring of concentration of salt in pool water, with easy operation and calibration. Device is waterproof and floats on water. Salt concentration is measured as electrical conductivity in mS. Device have 3 measuring ranges (0 - 200mS, 0- 2000mS, 0 - 20mS). Measuring is done by dipping the tip of device to water and reading what LCD display shows.