Here’s a direct, side-by-side comparison of two metabolic measurement tools — Microlife BodyGem RMR Tester and Breezing Pro Metabolic Analyzer — including what they measure, how they work, and who they’re best for.
What They Are
Microlife BodyGem
Portable handheld indirect calorimeter that measures resting metabolic rate (RMR) by directly assessing oxygen consumption (VO₂) while the person breathes into the device.
Typically used to provide clients’ true RMR for personalized nutrition and weight-management planning.
Breezing Pro
A wearable metabolic tracker measures both O₂ consumption and CO₂ production to calculate resting energy expenditure (REE/RMR) and respiratory quotient (RQ).
Provides more comprehensive metabolic data beyond just RMR — including RQ, which helps indicate substrate (fat vs carbohydrate) use.
Works with a mobile app (iOS/Android) for guided testing and trend tracking.
Key Differences
Measurement Method
Microlife BodyGem: Indirect calorimetry measuring VO₂ only to determine RMR.
Breezing Pro: Full indirect calorimetry measuring both VO₂ & VCO₂, allowing actual RMR + RQ.
Data Output
Microlife BodyGem: RMR on LCD panel. The Analyzer software creates a customized Daily Calorie Budget based on a clients’ RMR, lifestyle and weight goal.
Breezing Pro: RMR (REE), RQ, and other pulmonary metrics.
Ease of Use
Microlife BodyGem: Simple lightweight handheld device which you breathe into the mouthpiece while seated.
Breezing Pro: Wearable mask with straps around the head. Battery in device adds to the weight.
Accuracy & Validation
Microlife BodyGem: The BodyGem device is +/- 2.8% accuracy.
Breezing Pro: The Breezing device demonstrated between 90-100% accuracy with 95% confidence interval, so it’s +/- 5% accuracy.
Sensors
Microlife BodyGem: VO2 sensor does not have to be replaced.
Breezing Pro: Uses a disposable, single-use O2/CO2 sensor cartridge which cost $30 for a 5-pack.
Use For Children
Microlife BodyGem: Validated for ages seven and up. The limiting factor is the bite-wing mouthpiece filter size.
Breezing Pro: This device is not designed for use on children.
Respiratory Quotient (RQ)
Microlife BodyGem: Does not measure RQ.
Breezing Pro: Measured directly for substrate use insights.
Device Type & Portability
Microlife BodyGem: Handheld device with one button to press to initializa a measurement.
Breezing Pro: Wearable with mask/headgear; slightly more elements to set up.
Power
Microlife BodyGem: Uses an AC adaptor for constant power.
Breezing Pro: Has a battery which adds weight and could lose power during a measurement.
Cleaning
Microlife BodyGem: The mouthpiece filter and nose clip get replaced every measurement and you only need to clean the outside of the device with antibacterial wipe.
Breezing Pro: It has an extensive cleaning regiment to decontaminate the device. There doesn’t appear to be filter.
Best For
Microlife BodyGem: Fitness pros, dietitians, clinics needing quick RMR info.
Breezing Pro: Clinicians, researchers, and advanced metabolic coaching needing deep data and RQ.
What You Get Practically
Quick RMR measurement in ~5-10 minutes.
Simple, proven indirect calorimeter that replaces predictive equations with direct data.
Typically lower cost than more advanced metabolic carts or systems.
Great entry-level tool for many health professionals and trainers.
Breezing Pro
Offers full indirect calorimetry → actual measurement of both gas exchanges (VO₂ & CO₂), which enhances accuracy and adds respiratory quotient insights so you know what fuel the body prefers at rest.
Mobile app support makes collection and tracking easier and more modern, with trend histories.
Can be more informative for tailored nutrition and wellness programs or clinical research.
Which Should You Choose?
Choose BodyGem if:
✔ You mainly need reliable RMR measurements quickly and affordably.
✔ You’re a trainer, dietitian, or small clinic offering metabolic testing services.
Choose Breezing Pro if:
✔ You want full indirect calorimetry results including RQ — essential for deeper nutritional and metabolic insights.
✔ You want mobile connectivity with structured test guidance and data tracking.
✔ You’re in research, clinical practice, or advanced metabolic coaching.
The BodyGem indirect calorimeter system can determine metabolic rate for your client in 5-10 minutes. Metabolic testing provides a precise measurement of your clients RMR, which can account for up to 75% of their total calorie needs.
Metabolism testing is superior to estimation equations, such as the Harris-Benedict formula and Katch-McArdle formula.
Scientifically based metabolic rate weight loss empowers your clients to greater weight management success. Metabolic testing increases your revenue.
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