The SA-387-S Waterproof Pen-type Salinity Meter is a portable and accurate digital tester designed for saltwater quality measurement. With a measuring range of 0~19.99ppt and 0.01ppt resolution, it provides reliable salinity testing results for aquaculture, aquariums, laboratories, swimming pools, and marine applications. Featuring a compact waterproof pen-style design, clear digital display, and easy operation, this salinity meter allows users to perform quick measurements anytime and anywhere. Equipped with automatic temperature compensation and stable sensor performance, it ensures accurate readings under different conditions. Lightweight and convenient to carry, the SA-387-S is an ideal tool for professionals and daily users who need efficient water quality monitoring. OEM logo, customized packaging, and product solutions are available for global distributors and wholesalers.