Extech 407228 Heavy Duty pH/mV/Temperature Meter Kit Rugged pH meter with pH electrode, temp probe and carrying case Kit includes pH/mV/temperature meter, mini pH electrode, temperature probe, and carrying case Dual display for pH or mV and temperature (Celsius/Fahrenheit) Large 1.4-Inch (36mm) LCD display Easy 2 point Slope and Cal adjustments at pH 4 and pH 7