Analytical instrument manufacturer Hanna Instruments is encouraging more and more communities to test their drinking water sources. Hanna, inspired by National Drinking Water Week, is giving away a free chlorine colorimeter with every purchase of a pH meter via a coupon code. Both instruments can measure and analyze the amount of chlorine and acidity within water sources. For a full article about this topic, click here:: Drinking Water Week 2015: Hanna Instruments encourages communities to test drinking water