Tests salinity and specific gravity in marine aquariums to help maintain a healthy tank. Key Features: Included: 1x Hydrometer, 1x Stick, 1x Base An accurate and reliable aquarium salinity test equipment. Delivers precise full-range salinity and specific gravity readings Includes a built-in base so you can rest the hydrometer on a countertop or other flat surfaces when taking salt readings Salinity tester fits brackish and marine aquariums The hydrometer supplies an optimal specific gravity/salinity range indicator PPT scale with an extra-wide stabilizer base A bubble diffuser on water intake prevents micro-bubbles from forming on the needle Easy to fill and convenient without wetting your hands Perfect for testing both salinity and specific gravity of your brackish and marine tank Suitable for fresh water and seawater The salinity tester is made of transparent acrylic material, which is relatively hard and easy to read Easy to read and use Simply dunk it in the aquarium to fill it with water, then put it on a level surface to read the scale Easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result The reading is temperature-corrected and accurate to +/-0.001. The unit of specific gravity is 1. 000-1. 030 (ppt value: 0-43.9 degrees), the safe area is 1.020-1.023 (ppt value: 30.2-34.2 degrees), and the low specific gravity area is 1.000-1.019 (ppt value: 0- 28.9 degrees), the higher specific gravity area is 1.024-1.030 (ppt value: 35.5-43.9 degrees) The proportion of range: 1.000-1.030 Salinity range: 0-43.9 Size: 8.5 x 12.8 x 1cm Colour: Multi Material: Acrylic Made in: China Dimensions (HxWxD): 23.5x19x2 cm Weight:0.1 kg Manufacturer's Warranty: 1-year Warranty.