1. EFFORTLESS MEASUREMENT: Dip the electrode directly into the solution for quick and accurate measurements of dissolved oxygen levels. This digital DO9100 water tester with hand pin optimizes the testing process for swimming pools, aquariums, and home brewing applications without the need to remove protective covers. 2. VERSATILE APPLICATIONS: From seawater testing to monitoring drinking water quality, this dissolved oxygen meter adapts to different environments. It is an essential tool for both professional aquaculturists and home enthusiasts, ensuring oxygen levels in various water environments. 3. RELIABLE CONSTRUCTION: Made of quality plastic, this oxygen supply instrument has a durable design that can withstand regular use. Its sturdy construction ensures reliable performance over time, making it a durable part of your water test kit for consistent measurement accuracy. 4. PRECISION PERFORMANCE: With automatic temperature compensation and support for automatic single or twopoint calibration, this water tester provides precise results. It offers detailed specifications for measuring total dissolved solids, dissolved oxygen saturation, and temperature, ensuring accurate data for informed decisions.