Tropic Marin

High Precision Hydrometer

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Ensure that your equipment is reading correctly and your aquarium is at the right salinity with Tropic Marin's High Precision Hydrometer. 


Many tank inhabitants are sensitive even to minor changes of the water conditions. Unfortunately as we've all experienced, salinity reading equipment as well as calibration solutions can drift over time and it can occasionally be a challenge to ensure equipment is always calibrated correctly. That's where the Tropic Marin Hydrometer comes in. The Tropic Marin High Precision Hydrometer provides an exact and reliable measurement of specific gravity, and it never needs to be re-calibrated, so it's a perfect reference device for calibrating other equipment.

  • High precision hydrometer for determining the specific gravity in aquariums
  • Maximum deviation: 0.001 at 77° F (25° C)
  • Scale from 1.021 to 1.031
  • Resolution: 0.0001
  • Handmade


The hydrometer is handmade and designed to float vertically in the water. The maximum deviation is about 0.001 at 77° F (25° C).


Please note: The salt content of sea water is usually measured as specific gravity. Please check for the blue printing and the indication “Specific Gravity” at the Tropic Marin High Precision Hydrometer.


What's Included?

  • Tropic Marin High Precision Hydrometer
More Information
UPC 0619106510025
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Product Questions

Will this measure 1.020 SG? Thanks
Question by: G A on Aug 14, 2023, 5:04 PM
Hey there,
Thank you for reaching out to us. Yes, it will go to 1.18.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Aug 16, 2023, 8:31 AM
I purchased 2 of these - one was red in color at the bottom and the other is blue - other than that they look identical. Is there a difference between the 2 models other than the color?
Question by: Ray on Nov 9, 2022, 7:01 AM
Great question. No, there is no difference beyond color of material. Happy reefing!
Answer by: Ash Hoglund (BRS Staff) on Nov 9, 2022, 11:30 AM
What are the dimensions of this item. I would like to purchase a beaker to be used with this product.

Question by: Nicholas Tootill on Mar 9, 2020, 6:55 PM
Hi there,

It measures 14.25" inches long.

Take care
Answer by: Thomas Billington on Mar 11, 2020, 2:12 PM
how do use this thing? noinstructions?
Question by: john soto on Mar 7, 2020, 5:20 PM
Hi there,

It will float vertically in the water and the water line will correspond to a salinity.

Take care
Answer by: Thomas Billington on Mar 11, 2020, 11:09 AM