4 in 1 EC or TDS or or Temp soil tester is suitable for all kinds of soil gardening plants, using high-quality probes, rust and resistance. Too high or low soil organic carbon content hinder the growth of plants. Different fertilizers produce different soil ECs according to the characteristics of the and the different growth . The TDS value indicates contact with total soluble solids in water. The lower the tds value, the solubility of heavy metal ions in water. Nutrient solution is the key to cultivation, and different require different nutrient solution formulas. It can measure well and help you solve this problem. Operating Temperature: 0-50 Measuring range: EC: 0.00-19900us or cm 0 -199.0ms or cm :0.0-1990.0CF TDS: 0-19900ppm 1-199.0ppt Temp: 0-50 Accuracy: EC: 1us or cm 0.1mS or cm : 1CF TDS: 1ppm 0.1ppt Automatic Temperature Compensation: 0-50 Colour:As Shown Material:plastic Package Contents: 1 x Soil Tester(without 4 button batteries,You need to prepare yourself) 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.