HI9813-51 · HI9813-61 pH/EC/TDS/ Temperature Portable Meter • Waterproof • CAL Check™ (HI9813-61) · Allows the user to easily check the probe calibration status at any time. • Variable EC to TDS conversion factor · Factor automatically adjusts from 0.56 to 0.78 based on actual EC readings · Factor based on 442 curve for natural water • Automatic Temperature Compensation · All readings are compensated for variations in temperature • Low Battery Indicator The HI9813-61 and HI9813-51 portable meters feature a large LCD which displays either pH, EC, TDS or temperature readings along with tutorial instructions. The pH readings are displayed with a 0.1 resolution and an accuracy of ±0.1 pH while the EC and TDS readings are displayed with a 0.01 mS/cm and 1 ppm (mg/L) resolution and 2% full scale accuracy. The EC range of both meters is from 0.00 to 4.00 mS/cm and TDS is from 0 to 1999 ppm. The temperature correction coeÁcient (ȕ) is ¯xed at 2 %/°C and allows for automatic temperature compensated measurements of EC and TDS. These meters are calibrated manually to a single point with the use of two trimmers. pH is calibrated to pH 7.01 while EC/ TDS is calibrated to either 1.41 mS/cm (1413 µS/cm) or 1500 ppm. The LCD screen has battery life indicator as well as on-screen tutorial messages. No probe changes are required when switching your measured parameter between pH, conductivity and TDS. These multiparameter meters reduce the number of instruments required for daily water quality analysis. The supplied probe on both models feature a polypropylene body, ampli¯ed pH electrode with a built-in EC/TDS and temperature sensors. The ampli¯er for the pH electrode prevents interference from humidity and electrical noise from common sources including from motors, ballasts or pumps. The HI9813-61 and HI9813-51 are versatile meters for the agriculture, greenhouse and hydroponics industries. 7 Multiparameter 7.82 | www.hannainst.com portable
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