Sera Marin Floating Glass Hydrometer ReptiFauna Triple-sealed cartridges ensure trouble-free operation

Triple-sealed cartridges ensure trouble-free operation

Curved cutting edges for added safety

this versatile feeder ensures your fish receive the right amount of food at the right times—up to four times daily

change Bio-Bag monthly or sooner

This extra-tough rope can withstand hours of tugging and play

Sera Marin Floating Glass Hydrometer ReptiFauna Triple-sealed cartridges ensure trouble-free operationFor the uncomplicated monitoring of marine water density The salinity (salt contents) can be deduced from the measured density. Since the salinity of marine water in an aquarium must be kept constant, the aquarium water should regularly be checked accordingly. The water to be tested is filled into a sufficiently tall water glass, and the scale of the immersed hydrometer is read off on according to its immersion depth.