The Bluelab Combo Meter is a conductivity, pH and temperature meter all in one. This battery-powered portable meter can be used anytime, anywhere and features simple push-button pH calibration and an auto-off function to extend battery life. Meter will display temperature as Celsius or Fahrenheit, pH 0 to 14, and conductivity as electrical conductivity, conductivity factor or parts per million (ppm). The meter includes probes, pH calibration solution and two AAA batteries. Unit is covered by a five-year guarantee, except for the replaceable pH probe, which is covered for six months.