JBL ProAquaTest CO2 Direct & Refill

JBL ProAquaTest CO2 Direct & Refill - View 3

JBL ProAquaTest CO2 Direct & Refill - View 4

JBL ProAquaTest CO2 Direct & Refill - View 5

$8.39 ~~$11.99~~ In stock

Category: Aquarium Water Test

JBL Pro Aqua Test CO2 Direct Test

JBL Aquarium Water Test Kits & Refills

Simple and reliable monitoring of the aquarium water values. Determines the optimal carbon dioxide content for freshwater aquariums
Procedure: fill plastic cuvette with sample water, add reagent drop by drop until pink colour remains stable. Number of drops x 2 = CO2 content in mg/l
To use during periods of poor or no plant growth and fish mortality: once a week
You will find detailed information and troubleshooting tips about water analysis on the JBL website in Essentials/Aquarium
Package contents: 1 CO2 quick test incl. 2 reagents, plastic cuvette and colour chart. Reagent refill separately available

Available:

Complete Test Kit
Refill

Confirm the order

Check the specification, quantity and total at checkout.

Before work begins

Factor in processing and transit time when planning your order.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy

Refund requests

Use your order reference when explaining the issue to the store.

Please contact us for the refund processing timeframe before returning an item.

View policy

Delivery for your items

Check the destination and shipping charge before payment.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy

Sending an item back

Ask the store for instructions before packing and returning the item.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (4.3 / 5 · 4 reviews)

William V. ★★★★★ Oct 21, 2026

The drop-by-drop count to get my CO2 right took maybe ten minutes, and the color chart is dead simple to read even in dim aquarium light. For a freshwater tank like mine, it’s the easiest way I’ve found to stop guessing and actually see the level.

Ava L. ★★★★★ Oct 18, 2026

Finally, a test that actually gives me a clear reading of CO2 levels without guessing at color charts. The direct method is a lifesaver for keeping my plants thriving, and it’s so fast to use.

Aurora N. ★★★★☆ Oct 20, 2026

Setup was straightforward and the color chart is easy to read, which I appreciate. It takes a bit of guesswork out of getting the CO2 level right in my planted tank. The refill option makes this a practical long-term solution for me.