SEN0169

The SEN0169 by DFRobot is a more robust, higher-stress version of the SEN0161 unit. It features the same ease of connection ― just plug the PH2.0 interface into any analog input on the Arduino ―but offers an expanded pH range suitable for harsher environments and readings in both acidic and strong alkaline environments. Additionally, the SEN0169 offers long-firing operation for continuous testing (rather than the single-read functionality of the 161), and is completely waterproof (not only the front of the probe).