Put the probe into the fish tank to measure the water temperature (just immerse the probe in the water).<br> Easy-to-use suction cup and easy-to-read LCD screen; temperature readings within 1 degree<br> Large, easy-to-read LCD display; compact design, suitable for independent use<br> Temperature range -50 degrees Celsius to +70 degrees Celsius; working temperature -10 degrees Celsius to +50 degrees Celsius.<br> By a lr44 button battery (included)<br> Small size<br> Its size is shown in the figure:<br> Thermometer size: 2.17 x 1.46 inches<br> Cable length: 24.88 inches<br> Probe: 1.57 inches<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store