Reflex Wireless Smart Ketone Breath Meter | 80% Cheaper Than Ketone Test Strips | Ketone Analyzer | Ketone Meter Monitor | Real-Time Fat Burning Rate | Test Strips Replacement | Free Apps | KT-USB

Product description

The ReFleX Breath Testing Solution is widely used around the world, with its reliability and proven performance demonstrated by numbers. To date, more than 6,458,000 breath tests have been conducted, and it has been adopted by companies and organizations in 61 countries.

Key Points:

Over 6.45 million breath tests conducted worldwideAdopted in 64 countries

USB Ketone Breath Meter – Track Ketosis with Breath, No Strips Needed

Stay on top of your ketogenic or low-carb goals with the USB Ketone Breath Meter. This compact, battery-powered device uses advanced breath acetone sensing technology to provide quick, non-invasive ketone level measurements—no need for blood tests or costly strips.

USB Ketone Meter connects directly to your smartphone and works with the free “Ketone Breath Meter” app, available on both the Apple App Store and Google Play Store. You can even download and explore the app before purchasing the device to see how it supports your keto journey.

Powered by builtin rechargeable battery, the USB Ketone Meter is ideal for home, gym, or travel use, giving you the flexibility to check your ketone levels anytime, anywhere. Whether you’re practicing intermittent fasting, managing a keto diet, or tracking fat-burning performance, the USB Ketone Meter helps you stay informed and in control.

Smarter Breath Testing, Calibrated in Real Time for Unmatched Accuracy

Using the Ketone Breath Meter app for ketone breath testing delivers exceptional accuracy and consistency through advanced real-time sensor calibration. The app continuously fine-tunes measurements by factoring in environmental humidity, air pressure, sensor age, and airflow rate, while filtering out the effects of interfering organic gases. This intelligent calibration process preserves professional-grade precision over time, reducing the risk of false readings and ensuring dependable results in any environment. With every test, users can have complete confidence that their readings are optimized for accuracy, reliability, and trust.

Measure. Adjust. Burn More

Discover how the Ketone Breath Meter app, together with compatible devices like the KT-37B, KT-68B or KT-USB, helps you track ketosis and achieve your fat-burning goals with ease.

When your body runs low on carbs, it switches to burning fat as fuel. This produces ketones, which indicate whether you are in fat-burning mode.

Tracking your ketone levels helps you:

Confirm when your body is in ketosisMaximize fat-burning efficiencyFine-tune your diet and lifestyle for better resultsStay motivated with real-time progress

Unlike traditional methods, breath meters are:

Non-invasive – No needles or strips requiredUnlimited use – Test as often as you like with no extra costFast & Convenient – Get results in seconds, anytime, anywhere

Connecting the Ketone Breath Meter app with devices like the KT-37B, KT-68B or KT-USB gives you powerful insight into your metabolism. Track ketone levels, optimize your fat-burning mode, and stay consistent on your ketogenic or low-carb lifestyle.

Breath Meter = Smart Investment

Save More with Every Test

Tracking ketone levels doesn’t have to be expensive. With a Ketone Breath Meter, you can monitor your fat-burning state at a fraction of the cost compared to traditional ketone test strips.

The Cost of Test Strips Adds Up

Average ketone test strip: $0.05 USD per testRequires continuous repurchasingWasteful and inconvenient

Over time, the cost of strips can far exceed the price of the device itself.

Breath Meter = Smart Investment

Minimum test count: 3,500 tests per deviceEquivalent cost: only $0.014 USD per testNo strips, no refills, no hidden costs

With a one-time purchase, you gain the freedom to test as often as you want—without worrying about the ongoing expense.

Why Choose Breath Testing?

✔ Affordable – Save up to 80% compared to strips ✔ Minimum-Waste – No disposable waste ✔ Convenient – Unlimited testing anytime, anywhere

Take Control of Your Journey

Switch to a Ketone Breath Meter and enjoy accurate results, cost savings, and total convenience. Every breath test brings you closer to your optimal fat-burning mode—without burning through your wallet.

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Customer Reviews

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Price

$35.00$35.00 $35.00$35.00 $59.00$59.00
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powered by
2x AAA batteries smartphone via Type C or Lightning port builtin rechargeable battery n/a

number of sensor
1 2 1 n/a

compatible apps
Ketone Breath Meter Ketone Breath Meter Ketone Breath Meter n/a

What is the KT-USB Ketone Breath Meter? The KT-USB is a portable, battery-powered device that measures your breath acetone levels to estimate ketone production in your body.How does the KT-USB measure ketones? It uses semiconductor sensor technology to detect acetone in your breath, which correlates with fat metabolism and ketosis.Is the KT-USB compatible with my smartphone? Yes, it works with both Android and iOS devices.Do I need to install an app to use it? Yes, download the free “Ketone Breath Meter” app from the Apple App Store or Google Play Store.Can I download the app before buying the KT-USB? Yes, you can try the app before purchase to see its features and interface.What type of batteries does it use? The KT-USB is powered directly through your smartphone or tablet’s USB-C port. No batteries required.Do I need to buy test strips? No, the KT-USB does not use any test strips—it’s a non-invasive breath test.How accurate are the results? The device provides reliable readings based on breath acetone levels, though accuracy may vary with user technique and calibration.How long does it take to get a reading? Typically, results appear on the app within 10–20 seconds after exhaling into the device.How do I use the KT-USB? Plug the KT-USB device into your smartphone’s USB-C port, launch the Ketone Breath Meter app, tap “Start” to begin testing, and exhale into the sensor after the warm-up period.When is the best time to measure ketones? Measure at the same time each day, preferably in the morning or several hours after a meal for consistency.Do I need to fast before testing? It’s recommended to avoid eating, drinking, or brushing teeth 30 minutes before testing for best results.What do the ketone levels mean? Higher breath acetone levels generally indicate deeper states of ketosis and fat burning.Is this suitable for tracking a ketogenic diet? Yes, it’s ideal for keto, low-carb, or fasting lifestyles to monitor fat-burning progress.Can I use the KT-USB without the app? No, you need the app to see and log your ketone readings.Does the app track historical data? Yes, the app stores your past measurements for tracking trends over time.Is the KT-USB FDA-approved? This product is designed for wellness and personal monitoring, not for medical diagnosis.Can multiple users use the same device? Yes, but each user should use their own profile within the app for accurate tracking.Is the sensor replaceable? The sensor is built-in and does not require replacement, but device calibration is recommended over time.How often should I test my ketone levels? Most users test once or twice daily, depending on dietary goals.Can I use this while intermittent fasting? Absolutely. It’s an excellent tool to monitor ketosis during fasting.Is the KT-USB travel-friendly? Yes, it’s compact, lightweight, and battery-powered—perfect for travel.How do I clean the KT-USB? Wipe the mouthpiece area gently with a soft cloth. Avoid using water or solvents.What should I do if I get inconsistent readings? Ensure proper warm-up, do not eat or drink before testing, and follow the user guide for best practices.Where can I buy the KT-USB replacement parts or accessories? Replacement parts and accessories are available through authorized retailers or the official website.Why does my Ketone Breath Meter say “No Blow Detected”? When the app prompts you, blow into the device for 2–3 seconds. Blowing too long can overload the sensor and cause this error.Can I use the device to track the effects of ketone-boosting foods or drinks? Yes. The Ketone Breath Meter allows you to monitor how your ketone levels change after consuming ketone-enhancing foods or beverages.

Package Dimensions ‏ : ‎ 4.8 x 3.6 x 1.3 inches; 2.24 ounces
Item model number ‏ : ‎ KT-USB
Date First Available ‏ : ‎ November 3, 2025
Manufacturer ‏ : ‎ reflex wireless
ASIN ‏ : ‎ B0FZC6X2W8
Best Sellers Rank: #197,132 in Health & Household (See Top 100 in Health & Household) #7 in Ketone Breath Meters
Wireless & Non-Invasive Ketone Testing – Track your ketone levels anytime, anywhere—no painful finger pricks or messy test strips required. Just exhale for fast, accurate readings.
Smart App Integration Connects to a free app wirelessly to get real-time ketone tracking, history analysis, and progress monitoring for keto, low-carb, and fasting lifestyles.
High-Precision Acetone Sensor – Equipped with advanced semiconductor technology to provide reliable breath acetone measurements that reflect your fat-burning state.
Instant Plug-and-Play Operation – No complicated setup—simply long press the power button, exhale, and view your ketone level instantly on the app or screen.
Lightweight & Travel-Friendly – Compact and Light, this portable ketone monitor is perfect for home, gym, or travel—keep your diet on track wherever you go.
Cost-Effective & Eco-Friendly – Save money over time with a reusable breath sensor—no disposable blood ketone strips or lancets required.
Ideal for Keto & Fasting Users – Perfect for ketogenic diets, intermittent fasting, low-carb nutrition, or anyone aiming to monitor fat metabolism and weight loss progress.
Easy to Use for Beginners & Experts – Whether you’re new to keto or an experienced tracker, the intuitive design and app-guided interface make testing simple.
Maintenance-Free Design – Built for long-term use without consumables. Powered by your smartphone or tablet, the sensor automatically calibrates itself each time it connects to the Ketoner Breath Meter app.
Accurate & Convenient Results – Get instant insights into your metabolic state—stay in ketosis, manage your goals, and adjust your plan with confidence.