---
product_id: 6541540
title: "Fluval Sea Hydrometer for Aquarium, Medium"
brand: "hagen"
price: "5547 som"
currency: KGS
in_stock: true
reviews_count: 13
url: https://www.desertcart.kg/products/6541540-fluval-sea-hydrometer-for-aquarium-medium
store_origin: KG
region: Kyrgyzstan
---

# Ideal for marine aquarium salt levels Large, easy-to-read markings Accurate specific gravity measurement Fluval Sea Hydrometer for Aquarium, Medium

**Brand:** hagen
**Price:** 5547 som
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your marine world perfectly balanced—because your fish deserve the best!

## Quick Answers

- **What is this?** Fluval Sea Hydrometer for Aquarium, Medium by hagen
- **How much does it cost?** 5547 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/6541540-fluval-sea-hydrometer-for-aquarium-medium)

## Best For

- hagen enthusiasts

## Why This Product

- Trusted hagen brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **User-Friendly Readings:** Clear, large markings with ideal salinity range highlighted for instant clarity.
- • **Portable & Permanent Use:** Use it as a permanent fixture or a portable tester—flexibility that fits your routine.
- • **Precision Salinity Control:** Maintain perfect marine conditions with pinpoint accuracy.
- • **Seamless Aquarium Integration:** Slim, low-profile design that blends effortlessly into your tank’s aesthetic.
- • **Affordable Marine Health Essential:** Reliable, budget-friendly tool trusted by aquarists to keep marine life thriving.

## Overview

The Fluval Sea Hydrometer is a compact, glass device designed to accurately measure specific gravity and salt levels in marine aquariums. Featuring large, easy-to-read markings with an ideal salinity range highlighted, it can be used as a permanent in-tank monitor or a portable tester. Its slim design ensures it blends seamlessly into any aquarium setup, making it an essential, affordable tool for maintaining stable salinity and promoting healthy marine life.

## Description

Fluval Sea Hydrometer provides an accurate and convenient method of measuring specific gravity and salt level in marine aquariums. Regular testing is strongly recommended as stable salinity levels are essential for the health of marine fish and invertebrates. Compact and easy to use, the hydrometer can be permanently installed inside the tank for continuous readings. Its slim, low-profile design camouflages well inside the tank and will not diminish the aesthetics of the aquarium. It can also be used as a portable device, allowing you to take samples simply by submerging it in the water. The Fluval Sea Hydrometer features large, easy-to-read markings with ideal salinity range clearly marked in green for clarity.

Review: Affordable and accurate! - Works great when I calibrate with freshwater and put in but I don’t leave it in my tank, that might not work, but the way I use it to test my water it’s been perfect I love it! Very affordable and seems accurate!!!
Review: Disappointed.... - I already have one of these and it works great. I have a couple specimen specific tanks so I wanted to get one for each tank so I'm not always having to move them or put my hand in to do it. I ordered 2 more and both these new ones don't work. Rinsed them with fresh water and even rinsed them out with vinegar and still they don't work. I can see air bubbles on the armature and tried gently taping as per the instructions, the bubbles don't disperse. I never had this trouble with the one I have, it worked great from the get go and I've loved having it. I've had to rinse it once and awhile and even had debris get in it so I'd rinse it out and it was fine. I have a regular hydrometer that I use when mixing salt water so I've compared my first one with it and it's alway been pretty accurate. It was a no brainer to get the same brand, guess I was wrong. I'm disappointed with this purchase. I'll try soaking them in vinegar like other people suggested but more than likely I'll return them. If soaking works then I'll update my review.

## Features

- Helps measure specific gravity and salt level in marine aquariums
- Features large, easy to read markings
- Simple design-blends in easily
- Item Package Weight: 0.185

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B007MM0YUU |
| ASIN  | B007MM0YUU |
| Best Sellers Rank | #106,576 in Pet Supplies ( See Top 100 in Pet Supplies ) #20 in Aquarium Hydrometers |
| Brand Name | Hagen |
| Color | green |
| Customer Reviews | 3.7 3.7 out of 5 stars (822) |
| Date First Available | March 2, 2012 |
| Date First Available  | March 2, 2012 |
| Department | men, women |
| Department  | men, women |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 1 x 5.5 x 7.9 inches |
| Item Package Dimensions L x W x H | 7.8 x 5.43 x 1.02 inches |
| Item Weight | 23 Grams |
| Item model number | 14356 |
| Item model number  | 14356 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Manufacturer recommended age  | 1 month and up |
| Material | Glass |
| Number of Items | 1 |
| Product Dimensions  | 1 x 5.5 x 7.9 inches; 0.81 ounces |
| Size | Medium |
| Specific Uses for Product | Marine Aquariums |
| Style | Classic |
| Target Audience Keyword | fish |

## Product Details

- **Brand:** Hagen
- **Color:** green
- **Item Weight:** 23 Grams
- **Material:** Glass
- **Shape:** Rectangular
- **Special Feature:** Large Easy-to-read Markings, Simple Design, Marine Aquariums
- **Specific Uses For Product:** Marine Aquariums
- **Style:** Classic
- **Tank Volume:** 35 Liters
- **UPC:** 015561143561

## Images

![Fluval Sea Hydrometer for Aquarium, Medium - Image 1](https://m.media-amazon.com/images/I/81Zk0yoggSL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Affordable and accurate!
*by C***S on August 19, 2025*

Works great when I calibrate with freshwater and put in but I don’t leave it in my tank, that might not work, but the way I use it to test my water it’s been perfect I love it! Very affordable and seems accurate!!!

### ⭐ Disappointed....
*by M***H on April 29, 2017*

I already have one of these and it works great. I have a couple specimen specific tanks so I wanted to get one for each tank so I'm not always having to move them or put my hand in to do it. I ordered 2 more and both these new ones don't work. Rinsed them with fresh water and even rinsed them out with vinegar and still they don't work. I can see air bubbles on the armature and tried gently taping as per the instructions, the bubbles don't disperse. I never had this trouble with the one I have, it worked great from the get go and I've loved having it. I've had to rinse it once and awhile and even had debris get in it so I'd rinse it out and it was fine. I have a regular hydrometer that I use when mixing salt water so I've compared my first one with it and it's alway been pretty accurate. It was a no brainer to get the same brand, guess I was wrong. I'm disappointed with this purchase. I'll try soaking them in vinegar like other people suggested but more than likely I'll return them. If soaking works then I'll update my review.

### ⭐⭐⭐⭐⭐ Works well with proper maintenance
*by K***N on June 25, 2025*

Works well and is accurate as long as you flush it with freshwater afterwards or else the reading will start to become off due to salt buildup.

## Frequently Bought Together

- Fluval Sea Hydrometer for Aquarium, Medium
- Instant Ocean Sea Salt 50 Gallons, For Marine Aquariums, Fast Dissolving
- API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-03-17*