The Oakton 35634-10 pH Testr 10 is a handheld, waterproof and dustproof metre that floats, if dropped in liquid, and features a replaceable double-junction electrode within its reusable tester body. A portable metre 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 lab, industrial and food applications. This microprocessor-based metre 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 metreÃ¢ÂÂs waterproof and dustproof housing has an Ingress Protection (IP) 67-rating for protection against solid objects or liquids. It has a large, upright, dual-line LCD screen for ease of viewing, error messages, a hold function which freezes readings for recording, and an auto shut-off that turns the metre off after 8.5 minutes of nonuse to extend the life of the batteries. It has a protective cap to reduce contamination and a double silicone O-ring for ease of electrode module replacement.