The NUOBESTY High Precision Sturdy and Not Easy to Break Glass Salinometer Aquarium Salinity Hydrometer is designed for precise and reliable saltwater and pond water sample testing, perfect for fish tank water quality monitoring. Constructed of robust glass, this hydrometer ensures accurate readings while enduring long-lasting durability. Its precision guarantees a higher level of confidence in your testing results. With its unique design, it's easy to use, requiring only a small amount of sample water to ensure an exact reading. This salinometer is not only steadfast and reliable but also easy on the pocket, making it a cost-effective choice for both hobbyists and professionals. Experience the difference that high precision and affordability can make in your aquarium or pond water care routine.