Updated on 19 October, 2021
Get Hanna and let your testing get better! The specially designed, compact handheld Salinity Tester helps you test for saltwater clarity and accuracy. Designed to bring uniformity to salinity testing throughout the entire any-step process, the Hi 98 319 marine salinity tester automatically measures conductivity ( EC ) to determine the salinity level of artificial and natural seawater. Within minutes, the salinity and water temperature are digitalized on the LCD. Scaled by sample volume, results in parts per million (ppm), standard temperature (Tg), or specific gravity (SI).
The Salinity Tester's small body is easily portable and extremely reliable. It includes a stainless steel case, a user programmable dial, and a stainless steel calibration cap. The tester easily adjusts from five to seven parts per million (ppm), ten parts per hundred (ppc), or one part per thousand (SPF). The calibration cap conveniently houses the tester and keeps it from bumping into the sides of the tester or the table.
Many hobbyists use the Salinity Tester to test their aquariums. In fact, many saltwater aquarium forums and magazines contain threads about how to use the Salinity Tester. Using the Salinity Tester in your home aquarium will allow you to determine both the hardness and acidity of your water, which is important when setting up feeding systems for reef aquariums. The Salinity Tester can also be used to monitor salt levels in fresh water aquariums.
How does the Salinity Tester work? Salts are suspended in water. As water passes over them, they become saturated with water and begin to float on top of the water surface. Over time, they harden. If they harden too much, they will become cloudy and reduce the permeability of water. But if they are properly dissolved in the tank, their conductivity and density will change, and they will begin to refract and reflect light.
The Testers themselves are a set of electronic measurement devices. They consist of a conductivity tank, a surface area, a bium solution used as a reference, and a precision quartz crystal sensor. The conductivity tank contains water and is electrically charged. This creates a current which flows through the bium solution, and through the sensor. As the sample passes through the Tester, it will display results indicating the salinity, pH, and various other aspects of conductivity.
To test conductivity, you need a Salinity Tester. There are two types of pocket sized testers available. The first one is a multi meter. This works by using a probe that is inserted into the water column. By varying the pressure and water flow through the probe, you can determine how much of each component is separated. The second type is a single meter that works by detecting changes in an alkalinity/potassium or salt concentration in the water column.
With either type of tester, results can be seen in less than ten seconds. This makes them ideal for quick analysis. Most instruments that perform these types of tests include a calibration kit, conductivity meter, and graphite sensors. Most pocket marine aquarium salinity testers include a detailed calibration procedure which includes precise measurements of dissolved oxygen, total alkalinity, total calcium, and total magnesium.
Graphite sensors are especially useful for checking pH levels in the water. While most other testers will use standard conductivity and pH meters, graphite sensors give an accurate reading simply because they utilize the natural resistance of graphite to change shape. In other words, graphite is harder to resist crushing, so it becomes softer as it changes shape when pressure is applied. This means that a pressure change in the tank will have a greater effect on a graphite sensor than on a standard conductivity tester. Salinity Testers are made specifically for graphite sensors so you can easily get the best performance from your Salinity Tester.