Free Prime Shipping
Advanced Optics Dual Scale 1.0 to 1.070 S.G. Salinity Refractometer for Saltwater Aquarium
This dual-scale salinity refractometer is used to measure, monitor, and control the concentration of salt water and brine. Especially useful for aquarium and marine applications. This high-quality refractometer measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand. It replaces your difficult-to-read hydrometer. With just a couple of drops of aquarium water, you know exactly what your salinity is.