510(k) · Cleared
ClearedAria Wifi Smart Scale
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
Fitbit, Inc. · MNW Analyzer, Body Composition
Cleared on Jun 2, 2014 as substantially equivalent to K121971 (Zhongshan Transtek Electronics Co., Ltd., 2012) after a 164-day review. Its family tree reaches back 6 generations to 1994.
- Decided
- Jun 2, 2014
- Review
- 164 days
- Class
- Class II
- Product code
- MNW
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 6 generations to K930599 (1994). No later device cites it as a predicate yet.
- Root · 6 generations backK930599 Body Fat Analyzer Model TBF-105Tanita Corp. of America · 1994
- 5 generations backK014009 Tanita Body Composition Analyzer; Tanita Body Fat Monitor; Tanita…Tanita Corp. of America · 2002
- 4 generations backK040778 Tanita Innerscan Body Composition Monitor, Model BC-53X (Where X=0…Tanita Corp. of America · 2004
- 3 generations backK083838 Scaleman Body Fat Scales, Model: FS-148BW1 SeriesFook Tin Technologies Limited · 2009
- 2 generations backK102191 Transtek Glass Body Analyzer; Transtek Glass Body Analyzer; Transtek…Zhongshan Transtek Electronics Co., Ltd. · 2011
- 1 generation backK121971 Withings, Smart Body ScaleZhongshan Transtek Electronics Co., Ltd. · 2012
- This deviceK133872 Aria Wifi Smart ScaleFitbit, Inc. · 2014
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −6 | K930599 | Body Fat Analyzer Model TBF-105 | Tanita Corp. of America | 1994 | — |
| −5 | K014009 | Tanita Body Composition Analyzer; Tanita Body Fat Monitor; Tanita Ultimate Scale | Tanita Corp. of America | 2002 | — |
| −4 | K040778 | Tanita Innerscan Body Composition Monitor, Model BC-53X (Where X=0 to 9) | Tanita Corp. of America | 2004 | — |
| −3 | K083838 | Scaleman Body Fat Scales, Model: FS-148BW1 Series | Fook Tin Technologies Limited | 2009 | — |
| −2 | K102191 | Transtek Glass Body Analyzer; Transtek Glass Body Analyzer; Transtek Glass… | Zhongshan Transtek Electronics Co., Ltd. | 2011 | — |
| −1 | K121971 | Withings, Smart Body Scale | Zhongshan Transtek Electronics Co., Ltd. | 2012 | — |
| 0 (this device) | K133872 | Aria Wifi Smart Scale | Fitbit, Inc. | 2014 | — |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in MNW? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new MNW device
- #1 K231116 Multi-parameter detectorscore 11.4 · 14 generations · no Class I recall
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K121971 | Withings, Smart Body ScaleSummary page 1…Class 11 Substantial Equivalence This 510(k) submission demonstrates that the ARIA WiFi Smart Scale is substantially equivalent to the Smart Body Scale (Withings, K1 21 971) in both technology and intended use. Feature ARIA WiFi Smart Scale Withings Smart Body Sca… | 2012 |
What descends from it?
No later submission names this one as a predicate yet.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 20 years and passes through 4 companies; a new generation was cleared every 2.5 years on median.
- None of the 6 ancestors has a recall.
How does its category compare?
All MNW devicesMNW Analyzer, Body Composition: FDA decisions, review times, recalls and adverse event reports over 20 years. 2014, this device’s year, is highlighted.
FDA decisions per year · MNW
1in 2024
2026 to Oct 25, outlined.
Median 510(k) review, days · MNW
110in 2014
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · MNW
No recall names MNW since 2007.
Adverse event reports per year · MNW
3in 2024
MAUDE reports naming product code MNW, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 4 | 109 | 0 | 0 |
| 2008 | 4 | 134 | 0 | 0 |
| 2009 | 4 | 137 | 0 | 0 |
| 2010 | 1 | — | 0 | 1 |
| 2011 | 11 | 168 | 0 | 0 |
| 2012 | 4 | 103 | 0 | 0 |
| 2013 | 9 | 144 | 0 | 0 |
| 2014 | 3 | 110 | 0 | 0 |
| 2015 | 1 | — | 0 | 2 |
| 2016 | 0 | — | 0 | 15 |
| 2017 | 0 | — | 0 | 6 |
| 2018 | 0 | — | 0 | 16 |
| 2019 | 0 | — | 0 | 11 |
| 2020 | 0 | — | 0 | 12 |
| 2021 | 0 | — | 0 | 10 |
| 2022 | 0 | — | 0 | 8 |
| 2023 | 0 | — | 0 | 2 |
| 2024 | 1 | — | 0 | 3 |
| 2025 | 0 | — | 0 | 0 |
| 2026 | 0 | — | 0 | — |
What is it indicated for?
The ARIA WiFi Smart Scale is a body analyzer that measures body weight and uses bioelectrical impedance analysis (BIA) technology to estimate body fat percentage in generally healthy individuals 10 years of age or older. It is intended for home use only.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K133872 · printed Nov 5, 2026
Cite this page
510(k) Report. “K133872: Aria Wifi Smart Scale.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 5, 2026. https://510kreport.com/device/K133872
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026