--- product_id: 202981343 title: "CO2 Drop Checker Test Kit CO2 Clear Glass Capacity Monitor with Suction Cup for Aquarium Water Plant Fish Tank PH Test CO2 Kit" brand: "dannisly" price: "€ 13.94" currency: EUR in_stock: true reviews_count: 8 category: "Dannisly" url: https://www.desertcart.hr/products/202981343-co2-drop-checker-test-kit-co2-clear-glass-capacity-monitor store_origin: HR region: Croatia --- # Compact 4.5cm size fits any aquarium seamlessly Premium thick glass for crystal-clear CO2 readings Strong suction cup for secure, no-leak attachment CO2 Drop Checker Test Kit CO2 Clear Glass Capacity Monitor with Suction Cup for Aquarium Water Plant Fish Tank PH Test CO2 Kit **Brand:** dannisly **Price:** € 13.94 **Availability:** ✅ In Stock ## Summary > 🌿 Elevate your aquarium game with crystal-clear CO2 control! ## Quick Answers - **What is this?** CO2 Drop Checker Test Kit CO2 Clear Glass Capacity Monitor with Suction Cup for Aquarium Water Plant Fish Tank PH Test CO2 Kit by dannisly - **How much does it cost?** € 13.94 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/202981343-co2-drop-checker-test-kit-co2-clear-glass-capacity-monitor) ## Best For - dannisly enthusiasts ## Why This Product - Trusted dannisly brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Sleek & Durable Design:** Crafted from high-transparency, non-toxic thick glass that blends elegantly into any tank setup. - • **Effortless Installation:** Attach easily with the included suction cup—no tools, no hassle, just instant monitoring. - • **Precision CO2 Monitoring:** Keep your aquatic ecosystem perfectly balanced with real-time color-coded CO2 level alerts. - • **Visual FOMO Alert System:** Watch the indicator shift from blue to green to yellow—never miss a critical CO2 level change again. - • **Optimize Plant & Fish Health:** Maintain the ideal CO2 range to boost plant growth while ensuring your fish thrive safely. ## Overview The CO2 Drop Checker Test Kit features premium thick glass construction and a compact 4.5cm design, equipped with a strong suction cup for easy, leak-free attachment inside your aquarium. It visually monitors CO2 levels via a color-changing indicator solution (not included), enabling precise balance for optimal aquatic plant growth and fish health. Ideal for planted tanks, this tool ensures you never miss critical CO2 fluctuations, making it a must-have for serious aquarium enthusiasts. ## Description Product Detail : Name: CO2 Drop Checker Material: Glass Color: Transparent High: approx.4.5cm (1.77") Quantity: 1 Pcs Product Features: Made of high-quality clear glass, high light and non-corrosive. The CO2 drop checker is transparent, convenience for you observed it color turns. The indicator solution will turn from Blue to Yellow as dissolved CO2 levels increase. By keeping the drop checker solution near green at all times, aquarium can ensure optimal plant growth while keeping fish safe. blue represented CO2 insufficient; Turns green, the balance of CO2; Turns yellow, means your tank has too much CO2. Product Instructions: 1. Drop 5 drops of CO2 indicator(not include) into the glass checker. 2. Pour monitor to let the CO2 indicator flow into the test area. 3. Use straw to fill the tank water with the test solution area to 1/2. 4. Turn the opening facing of drop checker down. 5. Use a sucker to attach it to the side of your tank and wait for up to 2 hours. Package Includes: 1 x CO2 Drop Checker 1 x Suction Cup Sweet Tips: Please allow 1-2cm size error due to hand measure. Color may be a little different due to monitor and light brightness from pictures. This product does not comes with indicating solution, please refer to the product instructions on this page for specific installation and usage steps. If you have any questions, please feel free to contact us.NOTE: The CO2 indicating solution is NOT included in this package, please note this before you buy it. Review: Great quality - Just what I needed to replace the drop checker I accidentally lost. The quality is decent, I’m unable to judge the quality of the suction cup since I accidentally cut it in half while opening the package, but it FEELS very high quality and strong. It looks great in my planted 10 gallon, it’s easy to assemble, it doesn’t leak and it works as intended. A plus is the indicator liquid itself is easily added to this unlike some other brands. Review: Good item - Good material, good addition to checking co2 levels on water. ## Features - Material: The CO2 drop checker is made of premium thick glass material, with high transparency, non toxic, safe and durable, easy to measure CO2 levels at a glance. - Item Size: This glass drop checker is about 4.5cm/1.77" in height. Apply to fish tank, aquarium, especially aquatic plants, tropical fish to watch and cultivate for fish tank. - Feature: Monitoring CO2 levels in your planted fish tank is very important for the health of your plants and fish. And the CO2 indicator can keep the CO2 levels in your tank consistently by checking it regularly. - Easy to Install and Use: Make sure your test kit is clean. Drop 5 drops of CO2 indicator into the glass drop checker and make sure it is stored in the bulbous side of the valve with the opening facing down. Place suction cup (included) on the drop and attach the co2 drop checker to the side of your tank, completely submerge it in the tank water. Wait 2 hours to read Co2 levels. (NOTE: The CO2 indicating solution is NOT included in this package.) - Please Note: The indicator solution will turn from Blue to Yellow as dissolved CO2 levels increase, blue represented CO2 insufficient; Turns green, the balance of CO2; Turns yellow, means your tank has too much CO2. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B085Y6416J | | ASIN | B085Y6416J | | Best Sellers Rank | #242,892 in Pet Supplies ( See Top 100 in Pet Supplies ) #354 in Aquarium Test Kits | | Brand Name | Dannisly | | Customer Reviews | 4.3 4.3 out of 5 stars (47) | | Date First Available | March 16, 2020 | | Item Form | drop-shaped | | Item Weight | 0.02 Kilograms | | Item model number | US-B-0033 | | Manufacturer | Cobella | | Manufacturer | Cobella | | Manufacturer Part Number | US-B-0033 | | Model Number | US-B-0033 | | Package Dimensions | 4.33 x 1.69 x 1.5 inches; 0.71 ounces | | Target Species | Fish | | UPC | 619191310630 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Dannisly - **Item Form:** drop-shaped - **Item Weight:** 0.02 Kilograms - **Manufacturer:** Cobella - **UPC:** 619191310630 ## Images ![CO2 Drop Checker Test Kit CO2 Clear Glass Capacity Monitor with Suction Cup for Aquarium Water Plant Fish Tank PH Test CO2 Kit - Image 1](https://m.media-amazon.com/images/I/61dPRJs1rrL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great quality *by V***V on April 6, 2025* Just what I needed to replace the drop checker I accidentally lost. The quality is decent, I’m unable to judge the quality of the suction cup since I accidentally cut it in half while opening the package, but it FEELS very high quality and strong. It looks great in my planted 10 gallon, it’s easy to assemble, it doesn’t leak and it works as intended. A plus is the indicator liquid itself is easily added to this unlike some other brands. ### ⭐⭐⭐⭐⭐ Good item *by E***. on August 13, 2025* Good material, good addition to checking co2 levels on water. ### ⭐⭐⭐⭐ CO2 indicators review *by M***W on July 24, 2025* Bought many CO2 indicators B4 this one work really well the others one I've had all ways leak out the dye ## Frequently Bought Together - Cobella CO2 Drop Checker Clear Glass CO2 Indicator CO2 Capacity Monitor with Suction for Planted Aquariums - Clscea Aquarium Glass CO2 Diffuser Atomizer with U Tube Check Valve Suction Cup Premium Version - Clscea CO2 Indicator Solution Drop Checker Solution for Aquarium 60ml --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/202981343-co2-drop-checker-test-kit-co2-clear-glass-capacity-monitor](https://www.desertcart.hr/products/202981343-co2-drop-checker-test-kit-co2-clear-glass-capacity-monitor) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-19*