The Oakton 35634-30 pH Testr 30 is a handheld, waterproof and dustproof meter that floats, if dropped in liquid, and features a replaceable double-junction electrode within its reusable tester body. A portable meter is commonly used to measure the pH of substance such as food, beer or wine, and is also used to test cleaning water, rinse water, and wastewater, in chemical, industrial and food applications. This microprocessor-based meter has Automatic Temperature Compensation (ATC) for accurate readings in fluctuating temperatures, and three-point, push-button calibration with auto-buffer recognition of US and National Institute of Standards and Technology (NIST) standards for a wide range of results. The meter’s waterproof and dustproof housing has an Ingress Protection (IP) 67-rating for protection against solid objects or liquids. It ha