---
product_id: 9840302
title: "Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit for Aquarium, 75 Tests"
brand: "red sea"
price: "$148"
currency: NZD
in_stock: true
reviews_count: 8
category: "Red Sea"
url: https://www.desertcart.nz/products/9840302-red-sea-fish-pharm-are21405-saltwater-calcium-pro-test-kit
store_origin: NZ
region: New Zealand
---

# Compact 5.1x5.5x3.1 inch kit 75 precise titration tests ±2.5ppm high accuracy Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit for Aquarium, 75 Tests

**Brand:** red sea
**Price:** $148
**Availability:** ✅ In Stock

## Summary

> 🌊 Master your reef’s calcium game with precision and ease!

## Quick Answers

- **What is this?** Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit for Aquarium, 75 Tests by red sea
- **How much does it cost?** $148 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/9840302-red-sea-fish-pharm-are21405-saltwater-calcium-pro-test-kit)

## Best For

- red sea enthusiasts

## Why This Product

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

## Key Features

- • **75 Tests Per Kit:** Long-lasting supply lets you monitor your aquarium’s health without constant repurchasing.
- • **Compact & Organized:** Sleek, portable plastic caddy keeps all components neatly stored and travel-ready.
- • **Proven Coral Booster:** Accurate calcium readings empower you to dose confidently, promoting visibly healthier corals in just one week.
- • **User-Friendly Design:** Innovative syringe holder and vibrant color changes make testing effortless—even for colorblind users.
- • **Precision You Can Trust:** Achieve lab-grade ±2.5ppm accuracy for calcium levels, ensuring your reef thrives.

## Overview

The Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit offers 75 high-accuracy titration tests (±2.5ppm) in a compact, user-friendly kit designed for saltwater aquarium enthusiasts. Its innovative syringe holder and clear color changes simplify calcium monitoring, enabling precise dosing that supports vibrant coral health. Trusted by hobbyists and professionals alike, this US-made kit is a must-have for maintaining optimal aquarium conditions.

## Description

Calcium Pro is a high accuracy (+/- 2. 5ppm) Titration Test Kit (75 tests) - incl. professional titrator

Review: So easy…and a color change I can see well! - Being a color blind reefer is a struggle! I have switched to Hanna checkers for Phosphate, Nitrates, and soon alkalinity. The Hanna checker for calcium doesn’t get the best reviews and has extra steps needing RODI water and use of additional pipettes, so not as easy as most Hanna products. This Red Sea Pro Calcium is great! The syringe holder that allows you to swirl the vial while doing the titration is great. The vibrant color changes are very clear…and the blue color is one I can see. I have tried other kits that have been a struggle and I really didn’t know what my calcium was. After using this kit…I now securely know my calcium is indeed low, and I have begun dosing now that I can accurately test. My corals look better in just a week after starting to dose! Fantastic product!
Review: Great calcium tester - Arrived exactly as described on website. Item is well packaged and organized in a plastic caddy box. I’m looking forward to using it to test my saltwater calcium levels.

## Features

- Country Of Origin: United States
- The Package Length Of The Product Is 5.59842519685039 Inches
- The Package Width Of The Product Is 5 Inches
- The Package Height Of The Product Is 3.09842519685039 Inches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004FUJ5JI |
| ASIN  | B004FUJ5JI |
| Age Range Description | all stages |
| Best Sellers Rank | #77,231 in Pet Supplies ( See Top 100 in Pet Supplies ) #128 in Aquarium Test Kits |
| Brand Name | Red Sea |
| Customer Reviews | 4.7 4.7 out of 5 stars (116) |
| Date First Available | December 10, 2010 |
| Date First Available  | December 10, 2010 |
| Directions | use as directed |
| Included Components | all |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 5.12 x 5.51 x 3.15 inches |
| Item Package Dimensions L x W x H | 5.67 x 5.08 x 2.99 inches |
| Item Weight | 0.39 Kilograms |
| Item model number | 306009 |
| Item model number  | 306009 |
| Manufacturer | TopDawg Pet Supply |
| Manufacturer  | TopDawg Pet Supply |
| Material | cotton |
| Model Name | Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit for Aquarium |
| Number of Items | 1 |
| Product Dimensions  | 5.12 x 5.51 x 3.15 inches; 13.62 ounces |
| Size | 1 count (Pack of 1) |
| Specific Uses for Product | aquarium test kit |
| Target Audience Keyword | fish |

## Product Details

- **Brand:** Red Sea
- **Model Name:** Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit for Aquarium
- **Number of Pieces:** 75
- **Special Feature:** Quick Testing
- **Specific Uses For Product:** aquarium test kit

## Images

![Red Sea Fish Pharm ARE21405 Saltwater Calcium Pro Test Kit for Aquarium, 75 Tests - Image 1](https://m.media-amazon.com/images/I/71MhfXnVM0L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ So easy…and a color change I can see well!
*by S***C on February 5, 2024*

Being a color blind reefer is a struggle! I have switched to Hanna checkers for Phosphate, Nitrates, and soon alkalinity. The Hanna checker for calcium doesn’t get the best reviews and has extra steps needing RODI water and use of additional pipettes, so not as easy as most Hanna products. This Red Sea Pro Calcium is great! The syringe holder that allows you to swirl the vial while doing the titration is great. The vibrant color changes are very clear…and the blue color is one I can see. I have tried other kits that have been a struggle and I really didn’t know what my calcium was. After using this kit…I now securely know my calcium is indeed low, and I have begun dosing now that I can accurately test. My corals look better in just a week after starting to dose! Fantastic product!

### ⭐⭐⭐⭐⭐ Great calcium tester
*by P***D on June 23, 2025*

Arrived exactly as described on website. Item is well packaged and organized in a plastic caddy box. I’m looking forward to using it to test my saltwater calcium levels.

### ⭐⭐⭐⭐⭐ Easy test,I like the storage case
*by B***M on September 22, 2024*

Very easy to follow instructions and I like that all the pieces are in a nice sturdy storage container so I don't lose them.

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-11*