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
Includes - 1 x pH Meter, 1 x TDS Meter, 1 x Protective Case
pH Meter Tech Spec
Full measurement Range: pH 0 - 14
Resolution: 01 pH
Accuracy: 05 pH
Calibration: Three Points Automatic Calibration Button
Power Supply: 2 x 1.5V LR44 Button Battery
Dimension: 1"x 1.2" x 0.7"
Weight: 8 oz
Article: The VIVOSUN pH Meter: Calibration and Troubleshooting

TDS Meter Tech Spec
TDS: 0 - 9990 ppm (parts per million)
Degrees Fahrenheit: 0 - 176.0°F
Conductivity: 0 - 9990 µs/cm
Accuracy: ±2%
Dimension: 0.6" x 1.18" x 0.55"
Weight: 8 oz
Tips: TDS = Total Dissolved Solids, which is any salt, metal, or mineral in the water. Note: This ppm meter can't test seawater