---
product_id: 443196992
title: "Hanna Instruments Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams"
brand: "hanna instruments"
price: "€ 140.91"
currency: EUR
in_stock: true
reviews_count: 12
category: "Hanna Instruments"
url: https://www.desertcart.com.cy/products/443196992-hanna-instruments-hanna-marine-magnesium-checker-hc-hi783-saltwater-aquariums
store_origin: CY
region: Cyprus
---

# Fish target species 5 ml liquid volume 0.59 kg weight Hanna Instruments Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams

**Brand:** hanna instruments
**Price:** € 140.91
**Availability:** ✅ In Stock

## Summary

> 🔍 Dive into Precision Testing!

## Quick Answers

- **What is this?** Hanna Instruments Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams by hanna instruments
- **How much does it cost?** € 140.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/443196992-hanna-instruments-hanna-marine-magnesium-checker-hc-hi783-saltwater-aquariums)

## Best For

- hanna instruments enthusiasts

## Why This Product

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

## Key Features

- • **Compact Design:** Small size ensures easy handling and storage.
- • **Effortless Testing:** Fewer steps than traditional tests for a seamless experience.
- • **Single Parameter Focus:** Dedicated to magnesium, providing precise results every time.
- • **Versatile Applications:** Perfect for saltwater aquariums, marine setups, and aquaculture.
- • **Color-Coded Convenience:** Color-coded syringes simplify the magnesium testing process.

## Overview

The Hanna Marine Magnesium Checker HC HI783 is a compact and user-friendly magnesium tester designed specifically for saltwater aquariums and aquaculture applications. Weighing just 0.59 kg and featuring color-coded syringes, it simplifies the testing process, making it ideal for both novice and experienced aquarists.

## Description

Our Marine Magnesium Checker HC (HI783) is designed to accurately and quickly determine the magnesium level in marine (saltwater) samples. The digital readout makes measurements effortless. Our Magnesium Checker HC (HI783) is the first marine magnesium test of its kind! This Checker provides an uncomplicated, accurate, and budget-friendly way to measure magnesium in saltwater/marine environments. Color-coded syringes and straightforward testing steps ensure quick and easy measurements every time! Magnesium is vital in saltwater environments as it allows calcium and carbonate to be bioavailable for corals and invertebrates. Designed as a more accurate alternative to chemical test kits, our Marine Magnesium Checker HC (HI783) provides quick, accurate results in a few easy steps. Magnesium Checker Tips & Tricks for Accurate Measurements Measure liquids accurately by syringe by drawing up the plunger until the bottom seal of the plunger is at the desired volume mark. Do NOT raise the liquid to the mark as this will give a false high volume. An air gap between the plunger and liquid is normal. Always use clean, dry cuvettes and syringes/tips. Rinse with deionized (RODI) water only; never rinse with tank water. Dry the cuvettes before use to prevent dilution. Ensure the sample does not contain any debris. Whenever the cuvette is placed into the checker, it must be dry outside and free of fingerprints, oil and dirt. Wipe the cuvette thoroughly with HI731318 microfiber cleaning cloth or a lint-free cloth prior to insertion. Shaking the cuvette can generate bubbles, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette. Do not let the reacted sample stand too long after reagent has been added, as accuracy will be affected. Discard the sample immediately after the readng has been taken or the glass might become permanently stained. Keep the tips with their appropriate syringes during measurement.

Review: Good Magnesium Checker - This one was a little more involved than the alk, PO4 and NO3 checkers but still easy enough to use and great to have a number instead of guessing on standard tests. Helps to gauge when to add more Mg to the system.
Review: worth it - easy to use

## Features

- Fewer steps than other chemical tests
- Color-coded syringes make the magnesium test simple and effortless
- Dedicated to a single parameter
- Small size, big convenience
- Ideal for: Saltwater Aquariums, Marine, and Aquaculture Applications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B337ZK5N |
| ASIN  | B0B337ZK5N |
| Best Sellers Rank | #20,586 in Pet Supplies ( See Top 100 in Pet Supplies ) #25 in Aquarium Test Kits |
| Brand Name | Hanna Instruments |
| Customer Reviews | 4.3 4.3 out of 5 stars (226) |
| Date First Available | June 2, 2022 |
| Date First Available  | June 2, 2022 |
| Directions | 1. Ensure the Marine Magnesium Checker HC is turned on. 2. Rinse the cuvette with deionized (RODI) water. 3. Fill the cuvette with the marine (saltwater) sample up to the mark indicated on the cuvette. 4. Insert the cuvette into the Marine Magnesium Checker HC. 5. Press the 'Measure' button. 6. Follow the instructions on the digital readout. 7. After measuring, discard the sample and rinse the cuv… |
| Item Package Dimensions L x W x H | 9.21 x 6.5 x 2.6 inches |
| Item Weight | 0.59 Kilograms |
| Manufacturer | Hanna Marine Magnesium Checker® HC HI783 |
| Manufacturer  | Hanna Marine Magnesium Checker® HC HI783 |
| Package Dimensions  | 9.21 x 6.5 x 2.6 inches; 1.3 Pounds |
| Target Audience Keyword | fish |

## Product Details

- **Brand:** Hanna Instruments
- **Item Form:** handheld
- **Item Weight:** 0.59 Kilograms
- **Liquid Volume:** 5 Milliliters
- **Manufacturer:** Hanna Marine Magnesium Checker® HC HI783

## Images

![Hanna Instruments Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams - Image 1](https://m.media-amazon.com/images/I/41fpKPdLfKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good Magnesium Checker
*by B***E on August 8, 2025*

This one was a little more involved than the alk, PO4 and NO3 checkers but still easy enough to use and great to have a number instead of guessing on standard tests. Helps to gauge when to add more Mg to the system.

### ⭐⭐⭐⭐⭐ worth it
*by A***R on January 9, 2026*

easy to use

### ⭐⭐⭐⭐⭐ Worked great
*by S***Y on October 7, 2025*

Worked great

## Frequently Bought Together

- Hanna Instruments Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams
- Hanna Instruments High Range Nitrate Checker HI782

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-01-22*