zmart 5in1 Digital pH EC TDS Salinity Temperature Meter Pen Backlit Conductivity Tester for Aquarium Hydroponics Water Quality

---------------------------------------------------------------------- EC measurement range: 0–10000 uS/cm, 10.01–19.99 ms, 20.1–400 mS/cm Resolution: 1 uS/cm, 0.1 mS/cm Accuracy: ±2% of reading TDS measurement range: 0–1000 ppm, 1000 ppm–10000 ppm, 10.1–200.0 ppt Resolution: 1 ppm, 0.1 ppt Accuracy: ±2% of measurement Salinity measurement range: 0.00–25.00% Resolution: 0.01% Accuracy: 0.01–5.00% (±0.1%), 5.10–25.00% (±1%) pH measurement range: 0.01–14.00 pH Resolution: 0.01 pH Accuracy: ±0.05 pH Temperature range: 0.1–60.0℃, 32.0–140℃ Conductivity EC: Supports automatic identification of 3-point calibration (1413 μS/cm, 12.88 ms, 111.8 ms) and 3-point calibration (1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm). pH: Automatically identifies calibration solutions with 1 point (6.86), 2 points (6.86 4.00) (6.86 9.18), or 3 points (6.86 4.00 9.18). Size and weight: 183 x 37 x 37 mm (7.2 x 1.5 x 1.5 inches) / 90 g (3.2 oz) 1. Always clean the electrodes when the calibration solution runs out. 2. If the pH calibration solution is not recognized, the electrodes are faulty. Dear Customer, Thank you for your patronage. The pH meter requires three 1.5L LR44 batteries. Batteries are not included with products that come with batteries, as they would not pass customs. EC measurement range: 0–10000 uS/cm, 10.01–19.99 ms, 20.1–400 mS/cm Resolution: 1uS/cm, 0.1mS/CM Accuracy: ±2% of the reading TDS measurement range: 0–1000 ppm, 1000 ppm–10000 ppm, 10.1–200.0 ppt Resolution: 1ppm 0.1ppt Accuracy: ±2% of the measured value Salt concentration measurement range: 0.00–25.00% Resolution: 0.01% Accuracy: 0.01~5.00% (±0.1%) 5.10~25.00% (±1%) pH measurement range: 0.01 to 14.00 pH Resolution: 0.01pH Accuracy: ±0.05pH Temperature range: 0.1–60.0°C (32.0–140°C) Conductivity (EC): Supports automatic identification of 3-point calibration (1413 μS/cm, 12.88 ms, 111.8 ms) and 3-point calibration (1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm). pH: Automatic identification of calibration solution with 1 point (6.86), 2 points (6.86 4.00) (6.86 9.18), or 3 points (6.86 4.00 9.18). Size and weight: 183 x 37 x 37 mm (7.2 x 1.5 x 1.5 inches) / 90 g (3.2 ounces) 1. Always clean the electrodes once the calibration solution is depleted. 2. If the pH calibration solution is not recognized, the electrode is faulty. Dear Customer, Thank you for your patronage. The pH meter requires three 1.5L LR44 batteries. Batteries are not included with products that come with batteries, as they would not be able to clear customs otherwise.