Thanks to HBF Reader Paul for this tip!  [8 Ways to Connect with HBF]

Digital pH Tester.  Accuracty ±0.05 pH.  0-00 to 14.00 measurement range.  Resolution .01 pH.  Uses 2 LR44 batteries.  Buffer Solution Included

You can use a pH meter to check the pH of your water, mash, [test Star San effectiveness] and finished beer.

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

Digital pH Tester – High Accuracy Meter Of ±0.05 pH – Suitable For Water, Food, Aquarium, Pool & Hydroponics – Buffer Solution Included