Omega PHH-7011 is a microprocessor-based waterproof pH/mV/Temperature tester that can measure a wide range of pH, ORP, and Temperature with a replaceable electrode. It is equipped with a large LCD that displays pH and Temperature simultaneously and has an automatic Temperature Compensation (ATC) feature. The device also has a variety of functions, including a hold function, a maximum/minimum value function, and a battery low indicator, making it a versatile and user-friendly tool.