---
product_id: 451922683
title: "Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams"
brand: "hanna instruments"
price: "R2498"
currency: ZAR
in_stock: true
reviews_count: 5
category: "Hanna Instruments"
url: https://www.desertcart.co.za/products/451922683-hanna-marine-magnesium-checker-hc-hi783-saltwater-aquariums-marine-aquaculture
store_origin: ZA
region: South Africa
---

# Color-coded syringes for foolproof testing Compact handheld design, 590g Quick 3-min digital readout Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams

**Brand:** hanna instruments
**Price:** R2498
**Availability:** ✅ In Stock

## Summary

> 🌊 Master Marine Magnesium with Effortless Precision!

## Quick Answers

- **What is this?** Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams by hanna instruments
- **How much does it cost?** R2498 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/451922683-hanna-marine-magnesium-checker-hc-hi783-saltwater-aquariums-marine-aquaculture)

## 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 Powerhouse:** Lightweight and portable at just 590g—take precision testing anywhere your marine projects demand.
- • **Color-Coded Simplicity:** Intuitive syringes eliminate errors and speed up your testing routine—perfect for busy pros.
- • **Coral-Ready Confidence:** Maintain optimal magnesium to keep corals and invertebrates thriving—because your ecosystem deserves the best.
- • **Tailored for Marine Mastery:** Dedicated single-parameter testing ensures laser-focused accuracy for saltwater and aquaculture environments.
- • **Effortless Precision in Minutes:** Get accurate magnesium levels with a simple 3-minute digital readout—no guesswork, no hassle.

## Overview

The Hanna Marine Magnesium Checker HC HI783 is a handheld, digital magnesium tester designed specifically for saltwater aquariums and marine applications. Featuring a quick 3-minute digital readout and color-coded syringes, it simplifies magnesium measurement with high accuracy and minimal steps. Compact and lightweight, it ensures reliable monitoring of magnesium levels critical for coral and invertebrate health in marine ecosystems.

## 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: Misst was er soll. Einfach in der Handhabung
Review: Love being able to take 5 minutes out of my day to do the test. One tip, set a 30 second timer or the last step and shake vigorously. Then pop into the egg and hold the button till the 3 min counter starts. After 1 min is left open the egg and pull the glass vial out and tilt back n forth to dislodge any bubbles on the glass then pop it back in before the timer ends. That way you'll get a very very close reading if not a perfect reading. This is the new revision and works extremely well..

## 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 |
| Batteries Included | No |
| Customer Reviews | 4.3 4.3 out of 5 stars (227) |
| Date First Available | 7 June 2022 |
| Flavor | unflavored |
| Item Form | handheld |
| Item Weight | 590 g |
| Package Dimensions | 23.39 x 16.51 x 6.6 cm; 590 g |
| Quantity | 1 |
| batteries required | No |

## 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 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

### ⭐⭐⭐⭐⭐ Review
*by E***A on 27 January 2026*

Misst was er soll. Einfach in der Handhabung

### ⭐⭐⭐⭐⭐ Review
*by B***K on 28 April 2024*

Love being able to take 5 minutes out of my day to do the test. One tip, set a 30 second timer or the last step and shake vigorously. Then pop into the egg and hold the button till the 3 min counter starts. After 1 min is left open the egg and pull the glass vial out and tilt back n forth to dislodge any bubbles on the glass then pop it back in before the timer ends. That way you'll get a very very close reading if not a perfect reading. This is the new revision and works extremely well..

### ⭐⭐⭐⭐⭐ Review
*by B***E on 8 August 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.

## 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 South Africa*
*Store origin: ZA*
*Last updated: 2026-02-24*