Best Hanna HI-991300 Water Quality Meter Water Quality Meter Hanna HI-991300 is a reliable and portable water quality tester designed for accurate pH, conductivity, TDS, and temperature measurement. This Hanna water quality meter features easy two-button operation for quick calibration and settings. Its compact, waterproof IP67 housing and large tri-line display make it ideal for field use and water well testing. With automatic pH calibration, selectable TDS factors, adjustable temperature compensation, and an included multi-parameter probe, the HI-991300 delivers precise Water Quality monitoring for professional and on-site applications. Applications: Greenhouse irrigation monitoring, hydroponic solution testing, and groundwater quality assessment for agricultural nutrient pollution.