This portable dual-scale refractometer integrates 0-32% Brix sugar test and 0-28% salinity salt detection in one compact optical tool, built with built-in ATC automatic temperature compensation to offset temperature interference and deliver consistent, error-free data within 10℃ to 30℃. Featuring high-transmittance precision prism and clear double engraved scales, it requires no batteries; just drip a tiny liquid sample, close the cover plate and read accurate values instantly under natural light.

Crafted with corrosion-resistant aluminum body and anti-slip rubber grip, it fits tight palms for on-site portable testing. Multi-scenario applicable: measure fruit juice, syrup, brine, sauce for food processing, and calibrate seawater salinity for marine aquariums, fish tanks and seafood farming.

Complete accessory pack includes dropper, calibration screwdriver and dust-proof storage case to shield the optical lens from scratches and collision during transport. A practical cost-saving tester for aquarists, brewers, food factory QC and home DIY users.