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
Model 3540 pH/conduct., dual graph. displ., Abs/mV, TDS and Salin., 250 readings
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Model 3520 pH/temp meter, graph. displ., Abs/mV, 500 readings

Advanced Digital pH Meter Kit with GLP; 230 VAC/UK

Advanced Digital pH Meter Only with GLP, ATC; 120 VAC

Model 3510 pH/temp meter, dual displ., mV, 32 readings
