The HI9811-51 Portable pH/EC/TDS/Temperature Meter is a versatile and reliable multi-parameter instrument designed specifically for agriculture, greenhouse, and hydroponics applications. It combines pH, electrical conductivity (EC), total dissolved solids (TDS), and temperature measurement into a single compact device, reducing the need for multiple instruments.
Supplied with the HI1285-51 multiparameter probe, this meter integrates pH, EC/TDS, and temperature sensors into one durable polypropylene body. The built-in amplifier in the pH electrode minimizes interference from humidity and electrical noise, ensuring stable and accurate readings even in challenging environments.
The HI9811-51 features a user-friendly interface with a large LCD that clearly displays measurement values along with on-screen tutorial messages to guide users through calibration and operation. Dedicated keys allow easy switching between pH, EC, TDS, and temperature modes without changing probes.
pH measurements offer a resolution of 0.1 pH with ±0.1 accuracy, while EC (0–6000 µS/cm) and TDS (0–3000 ppm) measurements provide reliable results with 2% full-scale accuracy. The meter includes automatic temperature compensation for EC and TDS with a fixed coefficient of 2%/°C, ensuring consistency across varying conditions.
Calibration is simple and efficient using manual one-point adjustment. pH calibration is performed at pH 7.01, while EC/TDS calibration can be done at 1413 µS/cm or 1382 ppm using built-in trimmers.
Designed for field and routine use, the HI9811-51 is water-resistant and built to withstand demanding environments. With no need to change probes between measurements, it offers convenience, efficiency, and dependable performance for everyday water quality monitoring.
