4 in 1: You can the floor pH of 3.5 to 9,0,12 levels), sun light intensity (9 level), moisture (5 levels) and temperature ( C to 50 C 16 F 122 F) of the soil. Large, backlit LCD display: easy displaying different readings with the large LCD screen and green backlight allows you to attach the index in a dark condition to read. With a 9 V battery, not included in box contents. A Auto power off (APO) function helps to determine the lifetime of the conserve battery life. Also there is a low battery indicator on the screen. Easy to use: put a 9 volt battery (not included), remove the protective cover in the probe and turn it on, you can insert probe straight upwards and downwards, quiet, LCD screen clearly shows the four index of the area knew. Save time and energy with high efficiency, great hand tool for your garden and plants plants.Know when to the water, you can fit the pH value, or change the lighting for your garden, flowers, plants, floristry, both indoor and outdoor use.