Product Material: Plastic + Metal Color: Black Size: 16*6 Probe Length: 8cm Packing Contents: 1* Soil pH Tester 1.2-in-1 Function Tests the soil pH value of plants, quickly helping you to master professionally when you need to water your plants , control soil pH. 2. Accurate, reliable and high-quality double-needle detection technology greatly improves the speed and accuracy of detecting and analyzing soil pH and acidity, refusing to become a plant killer and promoting healthy plant growth. 3. Easy to use. Just insert the sensor probe into the soil about 15 cm, flip the switch to test the pH value, fertility you want to measure, and then wait a few minutes until the pointer stops swinging to get a stable reading on the dial. If the plant is very dry, the soil needle won't wiggle, which means your plant needs water. 4.COMPACT FOR INDOOR & COPACT for outdoor use: Portable and easy to carry anywhere you want. Know when to water your flowers, plants, adjust pH or change lighting. Refuse to be a plant killer, promote the growth of your plants in your home, garden, lawn or farm, etc. 5. No batteries required No batteries or electricity required, ready to use right out of the box. Plug and read.