Anneome 1set High Precision Hydrometer Temperature Gauge Glass Water Measuring Tester for Aquariums and Fishkeeping Lightweight Easy to Use

Salinity meter-- lightweight and suitable size, you can even store them in a small bag.

Densitometer for fish tank-- easy to use and read, high sensitivity probe, quick and convenience to use.

Sea water quality tester-- it is widely applied in sea water, aquarium, swimming pool, etc.

salinity hydrometer-- it has a simple design, but very practical in use, giving you a nice using experience.

Water salinity meter-- clear calibration, accurate and convenient measurement of density, practical to use.