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The '''Apple Watch''' is a wearable smart watch introduced by Apple in 2015 which includes a number of sensors that can be used for personal science. 
 
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{{Tool Infobox  
 
{{Tool Infobox  
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|Related topics=HRV (Heart Rate Variability), Activity tracking, Sleep tracking, Oxygen saturation
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|Related topics=HRV (Heart Rate Variability), Activity tracking, Sleep tracking, Blood oxygen
 
}}
 
}}
  
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Since the first release, Apple Watches include a heart rate sensor and accelerometers/gyroscopes for [[activity tracking]]. Since 2020, some Apple Watch models can also do rudimentary [[sleep tracking]].
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The Apple Watch is a wearable smart watch introduced by Apple in 2015 which includes a number of sensors useful for doing personal science. Since the first release, Apple Watches include a heart rate sensor and accelerometers/gyroscopes for [[activity tracking]]. Since 2020, some Apple Watch models also do rudimentary [[sleep tracking]], though the capabilities are still somewhat behind other wearables. Since the 4th generation, Apple Watches also include an [[ECG]] sensor that can be used to take manual readings and since the 6th generation they it includes a [[Oxygen saturation|Blood oxygen]] sensor. Beyond this, the Apple Watch also uses its microphone to regularly record environmental noise levels.  
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Since the 4th generation, Apple Watches also include an [[ECG]] sensor that can be used to take manual readings and since the 6th generation they it includes a [[Oxygen saturation|Blood oxygen]] sensor, though this has been disabled in recent models sold in the USA due to patent issues<ref name=":0">https://www.theverge.com/2024/1/17/24041945/apple-watch-series-9-ultra-2-blood-oxygen-ban</ref>.
 
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Beyond this, the Apple Watch also uses its microphone to regularly record environmental noise levels.  
 
  
 
==Data storage and export==
 
==Data storage and export==
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=== Exporting via Health Auto Export ===
 
=== Exporting via Health Auto Export ===
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The iPhone app [[Health Auto Export (Apple)|Health Auto Export]] provides a way to export selected data in JSON, CSV or GPX files (the latter for geolocation data from workouts). The CSV format in particular can be used to import data into Excel or other spreadsheet software. While the base-version of the application is free, additional export options can also be made available through an in-app purchase. This allows to automatically sync data to iCloud and also provides a way to synchronize data to other external services.  
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The iPhone app [https://apps.apple.com/us/app/health-auto-export-json-csv/id1115567069 Health Auto Export] provides a way to export selected data in JSON, CSV or GPX files (the latter for geolocation data from workouts). The CSV format in particular can be used to import data into Excel or other spreadsheet software. While the base-version of the application is free, additional export options can also be made available through an in-app purchase. This allows to automatically sync data to iCloud and also provides a way to synchronize data to other external services.  
  
 
== Projects using Apple Watch ==
 
== Projects using Apple Watch ==
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* [[User:Gedankenstuecke|Bastian Greshake Tzovaras]] used the environmental noise data to explore [https://forums.openhumans.org/t/headphone-vs-environmental-noise-levels/241 how the sound of his surroundings shape how loud he plays music on his headphones].
 
* [[User:Gedankenstuecke|Bastian Greshake Tzovaras]] used the environmental noise data to explore [https://forums.openhumans.org/t/headphone-vs-environmental-noise-levels/241 how the sound of his surroundings shape how loud he plays music on his headphones].
 
** He also used environmental noise data together with location data from [[Overland]] to [https://exploratory.openhumans.org/notebook/77/ explore how sound levels change throughout the city].
 
** He also used environmental noise data together with location data from [[Overland]] to [https://exploratory.openhumans.org/notebook/77/ explore how sound levels change throughout the city].
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** He recently adapted his website to [https://tzovar.as/exporting-data-apple-health/ show metrics from Apple Health (incl. from his Apple Watch) in the website footer].
 
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==Sensors in different Apple Watch series==
 
==Sensors in different Apple Watch series==
  
 
The table below is an abridged version of the [https://en.wikipedia.org/wiki/Apple_Watch#Comparison_of_models one found on Wikipedia], focusing on the sensors that are used on the different Apple Watch series.
 
The table below is an abridged version of the [https://en.wikipedia.org/wiki/Apple_Watch#Comparison_of_models one found on Wikipedia], focusing on the sensors that are used on the different Apple Watch series.
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{| class="wikitable mw-collapsible" style="text-align:center; font-size:90%"
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! colspan="2" | Specification
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{| class="wikitable"
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! style="background:#ff9999" |1st
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!Legend:
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! style="background:#ffdddd" |Series 1
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|{{legend2|silver|{{abbr|Discontinued and unsupported|Device is discontinued and no longer sold}}|border=1px solid #AAAAAA}}
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! style="background:#ffdddd" |Series 2
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|{{legend2|#f8eaba|{{abbr|Discontinued, but still supported |Discontinued older device versions, not currently being sold but still supported.}}|border=1px solid #AAAAAA}}
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! style="background:#ddd" | Series 3
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|{{legend2|#a4f4a4|{{abbr|Current|Current versions of devices being sold.}}|border=1px solid #AAAAAA}}
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! style="background:#f8eaba" |Series 4
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|}
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! style="background:#f8eaba" |Series 5
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! style="background:#f8eaba" |SE (1st)
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{| class="wikitable mw-collapsible" style="text-align:center; font-size:90%;"
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! style="background:#f8eaba" |Series 6
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!Specification<ref name="appleWatchCompare">https://www.apple.com/watch/compare/</ref>
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! style="background:#f8eaba" |Series 7
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! style="background:silver;" | 1st generation<ref name="appleWatch0TS">https://support.apple.com/kb/SP735</ref>
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! style="background:#d4f4b4" |SE (2nd)
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! style="background:silver;" |2nd generation (Series 1)<ref name="appleWatchCompare" />
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! style="background:#f8eaba" |Series 8
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! style="background:silver;" |2nd generation (Series 2)<ref name="appleWatchCompare" />
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! style="background:#f8eaba" |Ultra
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! style="background:#a4f4a4;" |3rd generation (Series 3)<ref name="appleWatch3TS">https://support.apple.com/kb/SP766</ref><ref name="appleWatchCompare" />
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! style="background:#d4f4b4" |Series 9
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! style="background:#f8eaba;" |4th generation (Series 4)<ref name="appleWatchCompare" />
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! style="background:#d4f4b4" |Ultra 2
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! style="background:#f8eaba;" |5th generation (Series 5)<ref name="appleWatchCompare" />
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! style="background:#a4f4a4;" |6th generation (SE)
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! style="background:#f8eaba;" |6th generation (Series 6)
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! style="background:#a4f4a4;" |7th generation (Series 7)
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|-
 
|-
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! rowspan="10" |Sensors
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![[Water Resistant mark|Water resistance]]<ref name="appleWatchCompare" />
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![[Heart rate tracking|Optical heart sensor]]
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| colspan="2" |[[IP Code|IPX7]] splash resistant (up to 1 meter)<ref name="appleWatch0TS" /><ref name="appleWatchCompare" />
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| colspan="4" |1st generation
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| colspan="7" |[[International Organization for Standardization|ISO]] 22810:2010 water resistant (up to 50&nbsp;meters)<ref name="appleWatch3TS" /><ref name="appleWatchCompare" />
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| colspan="3" |2nd generation
 
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| colspan="2" |3rd generation
 
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|2nd generation
 
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| colspan="4" |3rd generation
 
 
|-
 
|-
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![[Heart rate tracking|Electrical heart sensor (ECG/EKG)]]
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![[Heart rate monitor|Optical heart sensor]]<ref name="appleWatchCompare" />
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| colspan="4" |No
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| colspan="4" | 1st generation<ref name="appleWatch0TS" /><ref name="appleWatch3TS" /><ref name="appleWatchCompare" />
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| colspan="2" |Yes
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| colspan="3" | 2nd generation<ref name="Apple:Apple Watch Series 5 Technical Specifications">https://support.apple.com/kb/SP808</ref><ref name="Apple:Apple Watch SE Technical Specifications">https://support.apple.com/kb/SP827</ref>
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|No
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| colspan="2" | 3rd generation<ref name="Apple:Apple Watch Series 6 Technical Specifications">https://support.apple.com/kb/SP826</ref><ref name="Apple:Apple Watch Series 7 Technical Specifications">https://support.apple.com/kb/SP860</ref>
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| colspan="2" |Yes
 
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|No
 
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| colspan="4" |Yes
 
 
|-
 
|-
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![[Oxygen saturation]]
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![[Electrocardiography|Electrical heart sensor (ECG/EKG)]]<ref name="appleWatchCompare" />
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| colspan="7" |No
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| colspan="4" |No<ref name="appleWatchCompare" />
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| colspan="2" |Yes
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| colspan="2" |Yes<ref name="appleWatchCompare" />
 
|No
 
|No
 
| colspan="2" |Yes
 
| colspan="2" |Yes
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| colspan="2" |Yes (Disabled for U.S. models sold from January 18, 2024)<ref name=":0" />
 
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|-
 
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![[Body temperature tracking|Temperature sensor]]
 
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| colspan="10" |No
 
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| colspan="4" |Yes
 
 
|-
 
|-
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![[Accelerometer]]
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![[Oxygen saturation (medicine)|Blood oxygen sensor]]<ref name="appleWatchCompare" />
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| colspan="4" |16g
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| colspan="7" |No<ref name="appleWatchCompare" />
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| colspan="5" |32g
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| colspan="2" |Yes<ref name="appleWatchCompare" />
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| colspan="5" |High-g
 
 
|-
 
|-
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![[Gyroscope]]
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![[Accelerometer]]<ref name="appleWatchCompare" />
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| colspan="4" |Yes
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| colspan="4" |16g<ref name="appleWatch0TS" /><ref name="appleWatch3TS" /><ref name="appleWatchCompare" />
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| colspan="5" |Improved
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| colspan="5" |32g<ref name="appleWatchCompare" />
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| colspan="5" |High dynamic range
 
 
|-
 
|-
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![[Ambient light sensor]]
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![[Gyroscope]]<ref name="appleWatchCompare" />
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| colspan="14" |Yes
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| colspan="4" |Yes<ref name="appleWatch0TS" /><ref name="appleWatch3TS" /><ref name="appleWatchCompare" />
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| colspan="5" |Improved<ref name="appleWatchCompare" />
 
|-
 
|-
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![[Altimeter]]
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![[Altimeter]]<ref name="appleWatchCompare" />
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| colspan="3" |No
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| colspan="3" |No<ref name="appleWatch0TS" /><ref name="appleWatchCompare" />
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| colspan="3" |Yes
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| colspan="3" |Yes<ref name="appleWatch3TS" /><ref name="appleWatchCompare" />
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| colspan="8" |Always on
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| colspan="3" |Always on<ref name="appleWatch3TS" /><ref name="appleWatchCompare" />
 
|-
 
|-
 
![[Compass]]
 
![[Compass]]
 
| colspan="5" |No
 
| colspan="5" |No
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| colspan="9" |Yes
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| colspan="4" |Yes<ref name="autogenerated1">https://support.apple.com/kb/SP808?locale=en_US</ref>
 
|-
 
|-
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!Battery life
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!Introduced
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|24h
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|April 2015
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|24h
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| colspan="2" |September 2016
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|24h
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|September 2017
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|24h
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|September 2018
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|18h
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|September 2019
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|18h
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| colspan="2" |September 2020
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|18h
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|September 2021
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|18h
 
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|18h
 
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|18h
 
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|18h
 
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|36h
 
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|18h
 
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|36h
 
 
|-
 
|-
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! colspan="2" |Date released
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!Discontinued
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|April 24, 2015
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|September 2016
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|September 12, 2016
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|September 2018
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|September 16, 2016
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| September 2017
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|September 22, 2017
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|In production
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|September 21, 2018
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|September 2019
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|September 25, 2019
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| September 2020
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| colspan="2" |September 18, 2020
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|In Production
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|October 15, 2021
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| September 2021
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| colspan="2" |September 16, 2022
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|In Production
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|September 23, 2022
 
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| colspan="2" |September 22, 2023
 
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|- }
 
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|}
 
|}
  
 
== References ==
 
== References ==
 
<references />
 
<references />
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[[Category:Body temperature tracking tools]]
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{{Tool Queries}}
 
[[Category:Tools]]
 
[[Category:Tools]]
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[[Category:Fitness and heart rate tracking tools]]
 
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[[Category:Sleep tracking tools]]
 
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[[Category:Hardware]]
 

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