Extech PH90 Waterproof PH Meter
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<b>[Product Information]</b><br>
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<li>Simultaneous display of pH and Temperature</li>
<li>2 or 3 point calibration automatically recognizes buffer solutions (order pH buffers separately)</li>
<li>PTS (percent of slope) tells you when it's time to replace your electrode (below 70% or above 130%)</li>
<li>Automatic Temperature Compensation</li>
<li>Data Hold, Min/Max, Auto Power Off, and low battery indication</li>
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