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The MANTIS digital refractometer is ideal for measuring the salinity of your aquarium water, either directly or by means of its included bowl.
Main features of the Digital Refractometer:
High resolution in the values
High measurement precision (0.0001%)
Large, clear and backlit LCD screen
Low battery warning sound
Measurement start and end warning sound
Auto Temperature compensator
Reading the sample temperature
The cup is optional for aquariums that may have stray electrical interference but it works really nicely by just dip testing.