# Confidence Level

**URL:** <https://community.purpleair.com/t/confidence-level/9128>\
**Category:** General\
**Created:** [July 8, 2024, 8:43pm UTC](https://community.purpleair.com/t/confidence-level/9128 "2024-07-08T20:43:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![arsvelasco](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/arsvelasco/32/2555_2.png) [@arsvelasco](https://community.purpleair.com/u/arsvelasco)\
**Post date:** [July 8, 2024, 8:43pm UTC](https://community.purpleair.com/t/confidence-level/9128/1 "2024-07-08T20:43:06Z")

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I have two PurpleAir Flex sensors placed side by side.

One is giving me 100% confidence score while the other is giving only 49% confidence score. I have reset the networks and restarted everything and even changed the location where I am testing them. I suspect that one of them is faulty.

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**Author:** ![Kieran](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/kieran/32/6220_2.png) [@Kieran](https://community.purpleair.com/u/Kieran)\
**Post date:** [July 10, 2024, 4:49pm UTC](https://community.purpleair.com/t/confidence-level/9128/2 "2024-07-10T16:49:30Z")

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Hi @arsvelasco

A 49% confidence score does indicate that some sort of issue is occurring. This could be something as simple as debris inside the device. Generally, [sensor maintenance](https://community.purpleair.com/t/sensor-maintenance/1531) is a good place to start. Additionally, what is the name of your sensor?

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**Author:** ![Alyssa\_Knaus](https://avatars.discourse-cdn.com/v4/letter/a/e274bd/32.png) [@Alyssa\_Knaus](https://community.purpleair.com/u/Alyssa_Knaus)\
**Post date:** [October 17, 2024, 4:09pm UTC](https://community.purpleair.com/t/confidence-level/9128/3 "2024-10-17T16:09:49Z")

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Hi there, I have a PA-II SD sensor where the sensor confidence is reading around 67%. It seems that laser counter A is following similar trends to B but at a lower AQI. I have 6 sensors running in total that are all reading around the same values except for this one. I have attached what I see on the map for reference. Doesn’t look like a downgrade issue but would like to know next steps. Should I look into getting a laser counter replacement? Would like to know if there is anything I can do first before replacing. Thank you!

 ![Screen Shot 2024-10-17 at 10.22.28 AM](https://us1.discourse-cdn.com/flex020/uploads/purpleair/original/2X/c/c1bb8f5a1c0ec1ec023f6ccf0f5779922f48075a.png)  
 ![Screen Shot 2024-10-17 at 10.22.47 AM](https://us1.discourse-cdn.com/flex020/uploads/purpleair/original/2X/d/ddca8fcad925bf03ca4d2f1def80af4982df2655.png)

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**Author:** ![Kieran](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/kieran/32/6220_2.png) [@Kieran](https://community.purpleair.com/u/Kieran)\
**Post date:** [October 17, 2024, 11:46pm UTC](https://community.purpleair.com/t/confidence-level/9128/4 "2024-10-17T23:46:30Z")

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Hi @Alyssa_Knaus

I’ve pulled up that sensor and I agree with what you’ve stated. Replacement of the laser counters would fix the issue. But I would recommend you try [sensor maintenance](https://community.purpleair.com/t/sensor-maintenance/1531) first to see if it helps.