API Test Tubes: Perfect for Your Testing Needs

API Test Tubes are designed to be used with API Liquid test kits and are suitable for all API water testing kits where the original tube has been lost or damaged. These high-quality test tubes are equipped with a measuring mark at 5ml and include a rubberised cap to ensure the tubes remain protected and easy to handle.

Features and Benefits

  • Compatibility: Designed for use with all API Liquid test kits, ensuring accurate and user-friendly testing.
  • Easy-to-Read Measurement Mark: Conveniently marked at 5ml for precise and easy measurements.
  • Rubberised Cap: Protects the glass tube from cracking, providing longer-lasting durability and usability.
  • Noise Reduction: The rubberised cap helps to eliminate any clanking noises when working with multiple test tubes.
  • Single Tube or Box of 24: Purchase as a single replacement tube or a box of 24 for additional testing needs.

How to Use

  1. Fill the test tube with the desired amount of water to be tested, using the 5ml measuring mark for guidance.
  2. Add the appropriate API Liquid test kit reagents to the test tube, as directed in the original test kit instructions.
  3. Cover the test tube with the rubberised cap and gently mix by inverting the tube a few times to ensure proper mixing of the reagents.
  4. Allow the specified amount of time for the reaction to occur, as indicated in the test kit instructions. Once the time has passed, compare the colour of the test solution to the provided colour chart to determine the water parameter levels.

Aqua Gardening Suggests These are Best For

API Test Tubes are ideal for aquarium hobbyists, pond keepers, and water garden enthusiasts looking to replace lost or damaged test tubes for their API Liquid test kits. They are perfect for accurately and conveniently testing various water parameters to ensure optimal water conditions for plants and aquatic life.


What are the main features of API Test Tubes?

API Test Tubes are designed for use with API Liquid test kits and are compatible with all API water testing kits. They have a measuring mark at 5ml for accurate testing and come with a rubberised cap to protect the glass tubes from cracking and reduce noise.

How many test tubes can I purchase at once?

You can purchase API Test Tubes individually or in a box of 24, depending on your needs.

Can I use these test tubes with other brands of water testing kits?

Although API Test Tubes are specifically designed for API Liquid test kits, they may be compatible with other brands depending on the requirements of the specific test kit. It is recommended to check with the manufacturer of the test kit you are using to confirm compatibility.

What is the purpose of the rubberised cap included with the test tubes?

The rubberised cap provides additional protection for the glass test tubes, preventing them from cracking and reducing noise when handling or shaking the tubes during testing.

Are these test tubes suitable for both freshwater and saltwater aquarium testing?

Yes, API Test Tubes are designed for use in all API water testing kits, making them suitable for both freshwater and saltwater aquarium testing.

How should I clean and maintain the API Test Tubes?

To maintain the accuracy and consistency of your testing results, it is important to rinse the test tubes thoroughly with distilled water before and after each use. It is also recommended to store the test tubes in a clean and dry environment when not in use.

Can I purchase replacement caps for the API Test Tubes?

While the product listing does not specifically mention the availability of replacement caps, you may contact Aqua Gardening customer service to inquire about the availability of replacement parts for API Test Tubes.

Still Unsure if This Product is Right for You?

  • Submit a question via the Reviews & Questions tab on this page, and our team will respond to you
  • Login to check your Aqua Gardening Member Price
  • Book a free Consult with the Aqua Gardening team here
  • Still Overwhelmed? Start your Gardening Journey with a free eBook here

(SKU: 127344)

Shipping Calculator

Enter the quantity of product and your Australian suburb name to calculate the shipping costs for multiples of this item only. You can calculate the shipping costs for your entire order, including international orders, on the Cart Page.

Free Shipping Eligibility

Aqua Gardening offers free shipping on most orders above $249 that are not bulky items.  Once you place all the items you wish to buy in the cart, the combined shipping price will be shown in the cart, including Free Shipping if you are eligible. For full details please see our free shipping eligibility here.

Delivery Information

Back Order products

These are products we usually carry in stock but are temporary out of stock. These products will be back in stock within a few days. We can send you an email notification when they are back in stock if you click on the “Notify me when back in stock” link. See the full details here.

Click & Collect Only products

These products can only be collected from our Brisbane showroom as we can not ship them. If you place any of these products in your cart, you will only see the Click & Collect option at the checkout.

Fast Dispatch products

These are products that we have in stock in our Brisbane showroom, and they are available for immediate Click & Collect or Shipping. Keep in mind that if you have a product which is not listed as a Fast Dispatch product in your cart, there might be a delay on your order. See the full details here.

Special Order products

Special Order products are products that we do not regularly stock. These products will be ordered specially for you, or dispatched directly to you from our supplier. See the full details here.

Ship-To-Store products

Products marked with ship-to-store can still be shipped to us to collect in-store! Simply check out with the shipping address: 3/4 Billabong Street, Stafford, QLD, 4053. Once your order arrives, we’ll email you to let you know that it is ready to collect.


Limited Warranty - This product has been stored in a controlled environment to ensure you will receive the best quality product possible. Due to this reason this product is sold on a strict no refund or return policy, unless it falls under a warranty claim.


60 Day Returns - Not available for this product, please contact us if you have any issues. More details...