"TEST PH, OXIDATION REDUCTION POTENTIALS, REDOX CONNECTIVITY, RESISTIVITY, TOTAL DISSOLVED SOLIDS, MINERALS/SALTS AND TEMPERATURE; PROBE-FREE; NO FREQUENCY CALIBRATION NECESSARY; AUTO SHUT-OFF; INCLUDES MP-6P METER, FIELD CASE, (50 ML EACH) PH BUFFERS, CONDUCTIVITY BUFFERS AND TDS STANDARD, AND USER MANUAL; 1.9V BATTERY; 5 ML CELL CAPACITY; 4-DIGIT LCD DISPLAY"