The “Co Checker” transmits the data via audio jack. Currently, this App can be used on Finest Device.
CO Measurement Chekcer using audio jack
Updated on
Aug 4, 2026
Tools
Data safety
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Ratings and reviews
phone_androidPhone
2.2
44 reviews
5
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1
A Google user
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January 31, 2019
Calibration only took 20 seconds and consumed no battery ony phone. It does suck up a lot in the usage though I'm not sure how. The internal battery should cover the unit and the software should be light... That said it Only used 3% in 5 minutes of use.
22 people found this review helpful
Patty Strong
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January 2, 2025
This app totally changed how my apps show up. I can't figure out how to get my apps back the way they were. Totally messed up!!
5 people found this review helpful
John McElroy
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October 2, 2024
I can't believe they're still updating this! Works great with my COA1 sensor
7 people found this review helpful
Meter App
May 8, 2025
Thank you. I appreciate your compliments. Have a nice day.