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MethodologyAbout

Automotive

ELM327 V2.1 Alerón Brand. OBD2 Bluetooth Scanner Auto Diagnostic for iOS & Android, Car Check Engine Light Code Reader

Automotive3.8· 23,881 Amazon ratings

Bias-adjusted across 23,881 Amazon ratings, Bayesian-shrunk to the category prior so the headline score reflects relative quality — not a raw star average. Cohort: Automotive.

4.8%
Percentile · Global
4.4%
Percentile · Cohort
Automotive
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ELM327 V2.1 Alerón Brand. OBD2 Bluetooth Scanner Auto Diagnostic for iOS & Android, Car Check Engine Light Code Reader

How the score was built

Amazon ratings
23,881

used for the Bayesian percentile

Raw star average
3.8 / 5

unadjusted Amazon mean

Bayesian avg
3.80

raw rating shrunk to the category prior

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Same category · Automotive

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