Description: Features: It does not need a power source, and it has 5 functions in one. It can measure soil temperature/humidity, PH value, plant photosynthetic luminosity and environmental humidity. Measure the moisture, temperature, PH of the soil in the pot and the intensity of sunlight needed by the plant for photosynthesis. Easy to use, good quality. Specifications: Material: plastic Size :3*6*29cm/1.18*2.36*11.42" Probe length: 20cm/7.87" Battery: 1 X 9V battery (Not included) Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. Included: 1 X Soil PH Meter 1 X English Manual