Feature:FOR FISH TANK OUTSIDEThis thermometer is designed for the outside of the fish tank, just paste it directly. It is cordless, avoids the hassle of cord entanglement, more convenient and safer to use.LED DIGITAL DISPLAYIt adopts LED digital screen design, with large green font display, easy to read the data no matter day or night. Touch the button to display the temperature, and it will enter the sleep state after 5s.HIGH ACCURACYThe temperature range of the aquarium thermometer is 0C-60C, which can be used for different water temperatures. It has a built-in copper nickel-plated temperature probe, which is precise and sensitive and can sense changes every 0.1C.LONG BATTERY OPERATEDThe thermometer outside the fish tank has a built-in 3V button battery, which has ultra-low power consumption and can be used for about 5 years of standby time and is durable.MINI AND COMPACTThe thermometer is mini and compact, as thin as about 12mm/0.47inch, which fits the tank wall better and prevents it from falling. TypeA is about 43 x 43mm/1.69 x 1.69inch(L x W), TypeB is about 48mm/1.89inch(diameter).Specifications:Type: A(square), B(round)TypeA color: WhiteTypeB color: GreenMaterial: ABSPower by: Built-in 1 x button batteryTemperature range: 0C-60CTemperature measurement error: 0.5CMeasurement accuracy: 0.1CTypeA size: About 43 x 43 x 12mm/1.69 x 1.69 x 0.47inch(L x W x H)TypeB size: About 48 x 12mm/1.89 x 0.47inch(diameter x height)Package Includes:1pc x Digital aquarium thermometerNote:1. Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.3. This product is a thermometer outside the aquarium, it cannot be put into water, and the battery cannot be removed.