An affordable, Bluetooth-enabled digital peak flow meter that successfully bridges the gap between basic manual meters and premium smart spirometers.
Sonmol SMPF-2S Review: Affordable Bluetooth Peak Flow Tracking
The Sonmol Upgraded Digital Peak Flow Meter (SMPF-2S) builds upon the brand's entry-level model by adding crucial Bluetooth connectivity. Designed primarily for asthma and COPD management, it utilizes a differential pressure transducer to measure Peak Expiratory Flow (PEF) and Forced Expiratory Volume in one second (FEV1). The device features a built-in LCD screen for immediate readings and a Smart Risk Indicator that categorizes results into Green, Yellow, or Red zones based on the user's personal best. Unlike its predecessor, the SMPF-2S syncs seamlessly with the ePEF mobile app, allowing patients to track longitudinal trends, log symptoms, and share digital reports with their doctors without maintaining a paper diary. While it lacks Forced Vital Capacity (FVC) measurements and the rigorous maneuver quality prompts of more expensive clinical models like the Vitalograph asma-1 BT, its inclusion of two detachable mouthpieces and a sub-$90 price point make it an excellent mid-tier choice.
Sonmol Upgraded Digital Peak Flow Meter with ePEF App (SMPF-2S)
Sonmol
Our Score
Table of Contents
Clinical Summary
Clinical Performance Metrics
Quantitative assessment based on clinical testing protocols
Measurement Accuracy
Provides reliable daily trending for PEF and FEV1 using a differential pressure transducer, though it lacks the advanced quality prompts and strict tolerances of premium clinical devices.
Ease of Use
Very straightforward 'blow and read' design with the added convenience of automatic app syncing and easy-to-clean detachable mouthpieces.
App Quality
The ePEF app effectively logs data and displays trends, but it is somewhat basic in design compared to highly polished or AI-driven competitor apps.
Value for Money
At roughly $85, it offers a highly affordable entry point into Bluetooth-connected respiratory monitoring, significantly undercutting full-loop smart spirometers.
Quick Take
Key findings from our clinical evaluation
+
Strengths
- Adds Bluetooth connectivity for automatic syncing to the ePEF app.
- Measures both PEF and FEV1 instantly on a built-in LCD screen.
- Features a Smart Risk Indicator for quick assessment of asthma zones.
- Includes two detachable, easy-to-clean mouthpieces.
- Highly portable and lightweight design.
−
Limitations
- Does not measure Forced Vital Capacity (FVC).
- Lacks the rigorous maneuver quality prompts found on higher-end clinical devices.
- The ePEF app is functional but lacks advanced features and interface polish.
Real-World Usage
Practical considerations for daily operation
Daily Routine Impact
Greatly simplifies the daily routine by automatically sending PEF and FEV1 scores to a smartphone, eliminating the tedious chore of maintaining a physical peak flow diary.
Learning Curve
Use right out of the box
Maintenance
The two included detachable mouthpieces must be washed regularly with warm, soapy water to maintain hygiene and prevent sensor blockages.
Portability
Extremely portable. Its compact size easily fits into a bag or pocket, making it perfect for on-the-go monitoring and travel.
Manual Use
The built-in LCD screen allows it to be used manually just like its non-connected predecessor, providing immediate visual feedback without strictly requiring the app to be open to see the current score.
Cost & Coverage Analysis
Financial considerations and HSA / FSA eligibility
Pricing Breakdown
HSA/FSA Guidance
May be reimbursable through an FSA or HSA, but it is generally purchased out-of-pocket due to its relatively low retail cost compared to full-loop spirometers.
Cost Comparison
A highly cost-effective stepping stone. It is slightly more expensive than basic non-connected digital meters but significantly cheaper than full-loop smart spirometers.
Patient Suitability
Clinical indications and contraindications
Indicated For
- • Asthma patients who want automated digital logging without spending over $100.
- • Parents tracking a child's peak flow who prefer an app-based diary.
- • Users upgrading from traditional mechanical peak flow meters.
Contraindications
- • Patients requiring comprehensive FVC loop measurements.
- • Individuals who need strict maneuver quality prompts to ensure test validity.
Age Considerations
Suitable for adult and pediatric users who are capable of following instructions to perform a forceful exhalation maneuver.
Clinical Efficacy Assessment
Evidence-based evaluation of clinical performance
FEV1 Measurement Accuracy
Measures the precision of Forced Expiratory Volume in the first second.
Adequate for home tracking of airway obstruction, providing a reliable baseline for daily asthma action plans.
Longitudinal Trend Tracking
Evaluates the device's ability to consistently track respiratory changes over time.
The ePEF app successfully automates longitudinal tracking, representing a massive usability improvement over manual paper logging.
Clinical Spirometry Correlation
Assesses how closely the home measurements align with formal clinical pulmonary function tests.
Useful for basic asthma management, but lacks the comprehensive parameter scope and strict ATS/ERS 2019 quality prompts for full diagnostic correlation.
Comparative Performance
Ranked #12 of 14 clinically evaluated home spirometers devices
MIR Spirobank Oxi
MIR
Aluna 2 Smart Spirometer
Aluna
Sonmol Upgraded Digital Peak Flow Meter with ePEF App (SMPF-2S)
Sonmol
You're viewing this
Sonmol Upgraded Digital Peak Flow Meter with ePEF App (SMPF-2S) You're viewing this device
Sonmol
Clinical Context
Our #1-ranked home spirometers device demonstrated superior performance across key clinical metrics. Compare detailed specifications to make an evidence-based selection.
Clinical Recommendation
Final assessment and prescribing guidance
The Sonmol SMPF-2S is a highly practical, budget-friendly Bluetooth peak flow meter. By automating the data logging process for PEF and FEV1, it serves as an excellent, low-cost digital upgrade for basic asthma management.
Recommend If
You want the convenience of an app automatically logging your daily PEF and FEV1 scores, but you don't want to spend top dollar on a full-loop clinical-grade spirometer.
Avoid If
You require full diagnostic spirometry (FVC), or if you prefer a highly polished, heavily validated clinical ecosystem like the MIR Smart One.
Clinical Summary
Composite Score
Recommendation
Price Point
Where to Buy
Verified purchase options and current availability
Sonmol
30 day money back guarantee
Important Information
- • Prices and availability subject to change
- • Some devices may require a prescription
- • HSA / FSA eligibility: Usually Eligible
- • Purchase from authorized retailers for warranty protection
Alternative Devices
It bridges the gap between the non-connected Sonmol SMPF-1 and the slightly more expensive MIR Smart One. While it offers Bluetooth like the MIR, it lacks the proven turbine accuracy and highly polished app ecosystem of the MIR brand.
