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Old 11-08-2013, 11:24 AM
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RigglePLC RigglePLC is online now
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Join Date: Jul 2006
Location: Grand Rapids MI
Posts: 9,329
Lowes has the cheap ones. I had fairly good luck with these. I calibrated with Diet Coke=pH 4.2.
http://www.lowes.com/pd_251966-83666...9#BVRRWidgetID

Gemplers has bettter meters.
http://www.gemplers.com/shop/all-ph-meters

Rittenbouse:
http://www.rittenhouse.ca/asp/Product.asp?PG=686
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