This detector is an instrument used to determine the nitrogen (N), phosphorus (P) and potassium (K) content in soil. It is powered by 3*1.5V (AAA) batteries and is durable. (Batteries not included). The detector has a large LCD screen with backlight display, clear reading of data, and is easy to use even at night. Dual-needle detection, higher precision, faster, more accurate analysis Soil. Nitrogen, phosphorus and potassium are the three main nutrients required for plant growth. They have a vital impact on plant health and yield. This detector can help you evaluate soil fertility, guide reasonable fertilization, and improve crop yield and quality. It is suitable for a variety of fields and can meet the soil testing work of various gardening and planting sites, greenhouse planting, orchard seedlings, gardening planting, etc. NPK range: 0-1999mg/kg Temperature range: -10°C-80°C; 14°F-176°F Power supply: 3 AAA batteries (batteries not included) Display: LCD, backlight Automatic shutdown: Automatic shutdown after 30 seconds of no operation Colour:White+Green Material:ABS+Aluminum Package Contents: 1 x Soil detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.