The Hanna Instruments HI98319 Marine Salinity Tester is a digital meter that accurately measures the salinity of natural and artificial seawater. By testing electrical conductivity (EC), it provides fast and precise readings of both salinity and temperature. The device automatically uses the temperature reading to compensate the salinity measurement, displaying the final, corrected value on its clear LCD screen. Maintaining stable salinity is crucial for the health of fish and corals, allowing them to thrive rather than constantly adjusting to fluctuating water parameters.

This pocket-sized tester is packed with features designed for the modern aquarist, including durable graphite sensors that reduce polarization effects for more repeatable results. It allows you to easily cycle between three common measurement units: parts per thousand (ppt), practical salinity units (PSU), and specific gravity (S.G.). The HI98319 has a range of 0.0 to 70.0 ppt/PSU and 1.000 to 1.041 S.G., with an accuracy of ±1 ppt/PSU up to 40.0. The unit also includes calibration solutions to ensure continued accuracy and a selectable auto-off feature to preserve battery life.

This digital tester is the ideal tool for any saltwater aquarium hobbyist seeking an upgrade from traditional testing methods. If you find it difficult to read the fuzzy line on a standard refractometer or simply want a more convenient and foolproof way to monitor your tank's salinity, this device is for you. Its speed, accuracy, and ease of use remove the guesswork from a critical aspect of reef keeping, making it easier than ever to maintain a stable and healthy aquatic environment.