The Extech PH110 is a durable ExStik® meter that features a flat surface refillable electrode for measuring pH in liquids, semi-solids, and solids – no more electrode breakage or clogged junctions. Since you can refill the ExStik® quickly, you won't need to worry about the shelf life of its electrode. the ExStik® meter is an invaluable tool for measuring the pH in shampoo, body wash, facial cleansers, lotions, creams, and more. Use it to monitor pools and spas, or to measure acidity and alkalinity in soil, skin, and carpeting. It's valuable in hydroponic gardening or farming. Get important readings in cement, agriculture, fish farming, wastewater, antifreeze recycling, food preparation, cleaning supplies, and manufacturing of paper, pulp, and paint.