Features: Long service life and no failure; Strict safety and quality standards; No battery required, automatic power supply; High-precision rapid detection of soil acidity; Suitable for quick pH reference in vineyards, orchards, field production, plant care, lawn maintenance, gardens, plants Specification: Model: SPH003. Style: with lead Housing material: ABS pH range: 2.5 ~ 9 pH accuracy: 0.1 pH Display: pointer Working temperature: 5 ~ 50 C (41 ~ 122 F) Colour: Black Probe length: 160 mm / 6.30" Product size; 105 x 60 x 30mm/4.13 x 2.36 x 1.18" Total weight: 158 grams Net weight: 63 g Comments: 1. The pH of the soil is very important for the quality of plants. 2. Most plants cannot survive in soils that are too acidic or alkaline. 3. It is very important to make the pH value suitable for your crop. Instructions: 1. Measure the pH of the soil as much as possible to penetrate deep into the soil and check the upper part about 1 cm long. 2. On the table, the numbers 2.5-9 are numbers, and the number 7 is basically neutral. The smaller the value, the higher the acidity. Please adjust the pH of the soil according to the type of plant. 3. Please make sure not to touch the stone when inserting the electrode, and not too hard, otherwise it is easy to damage the electrode. Please clean the electrode after use. Note:This article is delivered without batteries