Carry one meter, not three! Measure pH, dissolved oxygen (mg/L, ppm or % saturation) and temperature (¡C or ¡F selectable). The completely waterproof pH/DO 300 does the work for you; automatically calculating barometric pressure and salinity offset values while insuring high accuracy with automatic temperature compensation and independent 100%, zero, and offset adjustment...
Carry one meter, not three! Measure pH, dissolved oxygen (mg/L, ppm or % saturation) and...