Suitable for most aquarium types. Comes with suction cups to attach it to the glass. Easy to perform rapid water temperature measurements. Floating style thermometer or fixed using suction pad provided. Inexpensive and accurate. Made from high quality materials. The Aqua One glass thermometer is inexpensive and accurate, bringing precision and reliability to the forefront of the design, to answer the real needs of the everyday aquarium hobbyists. It is incredibly durable too, resulting in a handy piece of equipment developed from high quality materials to ensure customer confidence. Aqua One thermometer is best placed at opposite sides of the aquarium to the heater (if heater is in aquarium) to prevent inaccurate readings being given. When not in use, keep stored out of direct sunlight and in a safe place away from children.