--- product_id: 394857413 title: "RCYAGO Smart Bluetooth Dissolved Oxygen Meter" brand: "rcyago" price: "€ 381.29" currency: EUR in_stock: true reviews_count: 5 url: https://www.desertcart.at/products/394857413-rcyago-smart-bluetooth-dissolved-oxygen-meter store_origin: AT region: Austria --- # RCYAGO Smart Bluetooth Dissolved Oxygen Meter **Brand:** rcyago **Price:** € 381.29 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** RCYAGO Smart Bluetooth Dissolved Oxygen Meter by rcyago - **How much does it cost?** € 381.29 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/394857413-rcyago-smart-bluetooth-dissolved-oxygen-meter) ## Best For - rcyago enthusiasts ## Why This Product - Trusted rcyago brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description RCYAGOSmart Bluetooth Dissolved Oxygen Meter ## Images ![RCYAGO Smart Bluetooth Dissolved Oxygen Meter - Image 1](https://m.media-amazon.com/images/I/61h863z3aXL.jpg) ## Questions & Answers **Q: When it wears out, how do you replace the protective sleeve?** A: It didn't even work so i returned it. Waste of money. **Q: Is the mobile app available on google play or apple store or is it a developer app with no scrutiny of security?** A: It doesn't even work. I put it in a 5 gal bucket with air stones and it read 0. Then i turned off the air stones and it gave me 3 differnt readings as i took it in and out of the bucket. Same water 3 different readings. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Measures Dissolved Oxygen and Temperature *by P***6 on February 9, 2022* The meter is easy to use, and the included instructions are thorough. The 5th photo refers to it as a PH meter, but the meter does not measure PH, only dissolved oxygen (DO) in both % and mg/l, and temp in both F and C.The left (up) button holds the measurement, and when held down, changes the temp units from C to F. The right (down) button changes the DO units from mg/l to %. When held, it puts the unit in calibrate mode. The power button, when held down, turns on the bluetooth function to connect to the app.The app was easily found via the QR code in the directions. Once installed, it requested location data and bluetooth access. I allowed bluetooth access, and when I put the meter in bluetooth mode (held down the power button), the meter connected immediately.The app is easy to use and allows additional functions to set altitude and salinity (which affect DO measurement), save the readings (auto save or manual), and turn on/off the backlight. You can 'share' the data which puts it in a .xlsx spreadsheet attachment to email/text/etc, according to your phones functions. The spreadsheet is formatted for several columns of other readings (TDS/PH/salinity/etc) which would appear to be for compatibility with other meters by the same manufacturer. You can also enter notes for each reading through the app.The probe requires an electrolyte solution, and includes instructions on how to clean and replace the solution. A bottle is included, along with 6 replacement probe/membrane covers. The probe comes with a membrane and solution already installed, which wasn't clear, so be careful when unscrewing the probe cover.Batteries (3x LR44/357 button cells) are replaced through a screw-on top cover which includes a rubber o-ring.The only drawback I found is that the backlight can only be turned on through the app. The display is a standard LCD display, it would be nice be able to turn on/off the backlight through a button (or by holding a button) on the meter itself. ### ⭐ Incomplete instructions, incomplete product *by C***N on February 17, 2023* The instructions are horribly unclear and misleading.It says "Unscrew the membrane, replace the electrolye. Then screw on the membrane." I believe I've interpreted what it's asking for is this:Unscrew the membrane: Have to find the very small diagram at the end of the instruction manual, and that explains what the "membrane" is. Take this all the way off.Replace the electrolye: What the mean is you take the bottle that says "Electrolyte Fill Solution" and you just fill that cup-shaped "membrane" with contents of the bottle. Make sure you have the right orientation with the clear end on bottom .I think this is why this little component is called a "membrane," because I believe that's what this clear end really is. You don't need to fill it literally to the top, because when you screw it back on, the little electrode deal is going to displace some of the solution.Screw on the membrane: You need to continue to maintain the membrane component with the clear end down, so that you don't spill out the solution. Recommend having a tissue or paper towel underneath this activity. Screw the probe and the membrane together, and make sure it's tight.I believe I've read on here that this membrane should come out of the box with solution loaded in already, but that was not the case for me. When checking the state of the solution inside, be careful that you have the right orientation, so you don't spill it everywhere.Also, the instructions mention the 100% calibration point and the 0.0% calibration point. For 100%, you're just going to measure the air, but for the zero point, it just says "Put electrode into the zero oxygen water." So I've done some research, and it seems that in order to perform this calibration, you have to obtain some sodium sulfite (Na2SO3) in order to make up a solution that would contain zero dissolved oxygen. There's no mention of the need for this anywhere on the seller page, in the instructional videos, in the instruction manual, or on the mobile app. They could have opted to include some amount of this needed reagent, but chose not to, for what reason I can't imagine. This zero oxygen water solution is (from what I've researched so far) not possible to make up from household chemicals. I considered trying concoct one, but am not sure how I might damage the membrane in doing so. So unless you want to go buy some specialty chemicals on the side and make up your own solution, then you'll end up just using the 100% calibration point. It's not explained how impactful this is to the effectiveness of the calibration. To be conservative, I'm assuming that it is severely impactful, and am probably just going to return this thing, since I'll never fully trust what it's telling me. ### ⭐⭐⭐⭐ Economical DO Meter *by M***C on March 14, 2022* Calibration was a challenge and there wasn't much online to assist. I was finally able to configure it with my iphone and feel pretty confident it was measuring well. For $100 instrument it was worth the investment. I am using this device to measure DO in my 2.5 acre farm pond. Readings were 8.2 - 10.7 % DO and temp was measuring around 70 deg. F. I am pleased with my purchase. ## Frequently Bought Together - RCYAGO Smart Bluetooth Dissolved Oxygen Meter - PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium - General Hydroponics CALiMAGic 1-0-0, Concentrated Blend of Calcium & Magnesium, Prevents Secondary Nutrient Deficiencies, Helps Prevent Blossom End Rot & Tip Burn, Clean, Soluble, & Will Not Clog, 6-Gallon --- ## 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.at/products/394857413-rcyago-smart-bluetooth-dissolved-oxygen-meter](https://www.desertcart.at/products/394857413-rcyago-smart-bluetooth-dissolved-oxygen-meter) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-04-23*