Water testing precise hand held refractometer portable

Hand Held salinity refractometer with dual specific gravity and part per thousand (0/00) scales. Designed specifically for aquariums, this unit is ideal for rapid, accurate salinity determinations. Fully automatic temperature compensation(ATC) over the range of 10° to 30°C eliminates need for temperature compensation charts. High contrast white on blue for easy readability. Includes soft-side carrying case.