An auto power off function helps to save battery life, there's low battery indication on the screen.Easy to Use -- Plug a 9V battery(not included), remove the protective cover on the probe, and turn it on, insert the probe straight up and down softly, the LCD screen will display the four index of the detected area.Helpful Tips -- Support switching temperature units between Celsius and Fahrenheit, just press the OFF button for that. Soil Tester can not be applied to test any other liquid. If the soil is too dry the indicator will not move, water it before testing. And read accurate results after five minutes.Wide Application -- Suitable for both indoor and outdoor. With lightweight design plant meter can be use for your garden, farm, potted plants,succulents, etc.No battery providedPower supply: 9V batteryDelivery Quantity: 1pc,(Package contents: Only the above package contents, excluding other products.)Size: 32*6.3cm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)Color: yellow(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)