Lab Grade pH monitor 1/100th accuracy with brand new probe - $70
 

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I have a lab grade pH probe monitor that is accurate to 1/100th accuracy (ie 8.28 pH) and it has a temperature adjustment for higher degree of accuracy.

This unit is about 4 years old but still working very well. I just bought a brand new pH probe for this unit thats still in the box. I've upgraded to a controller so don't need this anymore.