The HI9814 is a slim, lightweight, waterproof, portable meter that measures the pH, conductivity (EC), total dissolved solids (TDS), and temperature of nutrient solutions used in hydroponics, aquaponics and greenhouse growing. The meter has two-button operation, one for turning the meter on/off and calibration while the other switches between the measurement modes. The HI9814 has advanced features including a selectable EC to TDS conversion factor (0.5 - 500 ppm and 0.7 - 700 ppm). 3 in 1 amplified probe with pH, EC/TDS and temperature sensors Quick Cal Mode to calibrate pH and EC/TDS with one solution EC to TDS Conversion factor selectable between 0.5 (500 ppm) and 0.7 (700 ppm) SKU HI9814 Product Name GroLine Hydroponics Waterproof pH/EC/TDS/Temperature Portable Meter - HI9814 Quote Required No pH Range -2.00 to 16.00 pH pH Resolution 0.01 pH pH Accuracy ±0.02 pH pH Calibration automatic, at one or two points using standard buffers (pH 4.01, 7.01,10.01); one point calibration using quick calibration solution pH Temperature Compensation automatic ‐5.0 to 105.0 °C/23.0 to 221.0 °F pH CAL Check (electrode diagnostics) probe condition indicator pH Sensor Check yes mV Range ±825 mV (pH‐mV) mV Resolution 1 mV (pH‐mV) mV Accuracy ±1 mV (pH‐mV) EC Range 0.00 to 6.00 mS/cm EC Resolution 0.01 mS/cm EC Accuracy ±2% FS EC Calibration automatic, one-point at 1.41 mS/cm; one-point calibration using quick calibration solution TDS Range 0 to 3000 ppm (500 CF); 0 to 3990 ppm (700 CF) TDS Resolution 10 ppm (mg/L) TDS Accuracy ±2% F.S. EC/TDS Temperature Compensation automatic Temperature Correction Coefficient β = 1.9%/°C EC to TDS Conversion Factor 0.5 (500 ppm) or 0.7 (700 ppm) Temperature Range ‐5.0 to 105.0 °C; 23.0 to 221.0 °F Temperature Resolution 0.1 °C; 0.1 °F Temperature Accuracy ±0.5 °C; ±1.0 °F pH/EC Probe HI1285-7 pH/conductivity probe with built-in temperature sensor, quick connect DIN connector and 1 m (3.3’) cable Automatic Shut-Off user selectable Battery Type/Life 1.5V (3) AAA / approximately 600 hours of continuous use IP Protection IP67 Environment 0 to 50 °C (32 to 122 °F) RH max. 100% Dimensions 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”) Weight 196 g (6.91 oz.) Ordering Information HI9814 is supplied with HI1285-7 multiparameter probe, HI50036-0 Quick Cal buffer solution sachet (3), HI700661 pH electrode cleaning solution sachet for agriculture (3), 1.5 AAA batteries (3), calibration certificates for both meter and probe and instructions.