Trolmaster pH Sensor for Tank (PPH-1) provides precise and reliable pH monitoring with Aqua-X. The PPH-1 probe connects to Aqua-X via AMP-2 for flexible positioning. The BNC connector allows a direct connection to the AMP-2 sensor board. If the pH probe dries out completely, it will no longer function properly. A pH sensor that dries out is not covered by the warranty.