Algae Research Supply: Battery Operated pH Meter, Milwaukee Instruments MW101

pH Meter,  Range:  0.00 to 14.00 pH and 0 to 70 C, ±0.01 with ATC & Automatic Calibration, Comes with a SE220 Double Junction pH Probe & MA830R Temperature Probe, 9 V Battery, 20 ml. pH 7.01 & 4.01 Sachet Calibration Solution

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