Handheld design with a nonslip pentype handle for comfortable, onehanded operation. Builtin automatic temperature compensation ATC for precise results across temperature variations. Measuring range: 0.00 ppt to 9.99 ppt and 10.0 ppt to 50 ppt, enabling quick and easy testing. Temperature units switchable and backlight switchable for convenient use in dark or lowlight environments. Replaceable sensor probe with an inserttype design for convenient and fast replacement. Use scenarios Aquaculture and marine hobbyist setups: regularly test seawater or brackish water to monitor salinity levels and maintain healthy conditions for fish and invertebrates. Agriculture and hydroponics: monitor irrigation water or nutrient solutions to ensure proper salinity and maintain plant growth. Field water quality checks: sample ponds, lakes, or streams to assess salinity levels during environmental monitoring or water management activities.