ZTS-TDS Pen Tester WR Range: 0-1999 ppm (mg/l), Resolution: 1 ppm (mg/l), Accuracy: ±2% Full Scale, Battery Life: DC 4x 1.5V, Temp.℃: 5--50℃ (ATC) , Features: Automatic switch-off function: After 10-15 minutes without pushing buttons, the meter will be switched off automatically.[...]

RS-100A Nutrient-Wand TDS Meter Range: PPM: 280--3080, EC: 0.4—4.4, CF: 4--44, TDS Factor: 700ppm = 1EC = 10CF, Temp.℃ Range: 5--45℃, Temp.Compensation: ATC Features: Auto turn on & off, Auto turn Check. Battery Life: DC 3 x 1.5V Display: LED x 16[...]

ZDS- EC Pen Check WR Range: 0.00-19.99 EC(mS/cm), Resolution: 0.01 EC, Accuracy: ±2% Full Scale, Battery Life: DC4 x 1.5V, Temp.℃: 5--50℃ (ATC), Features: Automatic switch-off function: After 10 minutes without pushing buttons, the meter will be switched off automatically.[...]

PH-902 Pen pH Testr WP Range: 0.00—14.00 pH, Resolution: 0.01 pH, Accuracy: ≤±0.03 pH, Temp. C: 5—50℃, (ATC) Calibration: Two-point at 6.86pH and 4.01pH (or 7.0pH and 4.01pH) Features: Automatic switch-off function: After 10 minutes without pushing buttons, the meter will be switched off automatically. Low battery：As long as there is any display, the accuracy is guaranteed. Battery Life: DC 4x 1.5V Flug:Changeable electrode[...]

ZD-05 SOIL PH AND MOISTURE TESTER Range: pH: 3-8 pH ; Moisture: 1-8 Notes: Soil pH value is a very important factor for the quality of crops. Most of crops cannot survive in too acid or too alkaline soil. Get the right pH reading for your Crop is very important. Size：Ø5.5 X 160 mm Weight：145g[...]