Description:Scientifically accurate:Easy & accurately to read moisture, pH and light levels, promotes healthy plants. Moisture Range:1-10 (1-3 DRY, 4-7 NOR, 8-10 WET); Relative Light:0-2000 Lux (0-200 LOW, 200-500LOW+, 500-1000 NOR 1000-2000 HGH); pH Range:3.5-8 pH (3.5-6.5 ACID, 7 NOR, 7-8 ALKALI). Just need plug and read . It's very easy to use! If the plants are very dry, the Soil Meter's Pointer will does not rotate! It means that your plants need to water right now. Compact for indoor or outdoor use:Know when to water, adjust pH, or change lighting for your garden, flowers, plants both indoor and outdoor. Measures moisture at root level. No battery required, simple and convenient to use. Simply insert the meter into the soil, switch to the setting you want to measure and read the scale. Specifications:Material:Aluminium Alloy, Plastic. Size:50*38*290mm. Probe Length:20.2cm / 7.95in. Color:show as pictures. PH Range:3.5-8.0 (3.5-6.5:ACIDIC, 7:NOR, 7-8:ALKALINE). Moisture Range:1-10 (1-3:DRY, 4-7:NOR, 8-10:WET). Light Range:0-2000. Notes: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. To avoid damaging the electrode, do not use in soil with stones and insert forciblyplease clean the electrode after each use. Package include:1 * 3-in-1 Soil Meter.