pH Meter: Measure Acidity or Alkalinity of the Soil TDS Meter: Include EC, TDS, and Temp Function, TDS don't need to calibrate. Premium Quality: High Accuracy and Quick Reading Easy to Use: Battery Included, Light Weighted, Easy to Read Humanized Design: Hand-held Design for Portability and Convenience Wide Application: Water Purification Applications, Aquaculture, Hydroponic, Pool & Spa, Colloidal Silver, Water Treatment, and so on Package Includes: 1 x pH Meter, 1 x TDS Meter, 1 x Protective Case