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@@ -121,15 +121,15 @@ You'll need Arduino desktop app 1.8.9 or later.
 ### Sensor manufacturers:
 | Sensor | Manufacture | URL Datasheet |
 |----------|----------|----------|
-| MQ-2 | Pololulu| [datasheet](https://www.pololu.com/file/0J309/MQ2.pdf) |
-| MQ-3 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/MQ-3.pdf) |
-| MQ-4 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-4.pdf) |
-| MQ-5 | parallax | [datasheet](https://www.parallax.com/sites/default/files/downloads/605-00009-MQ-5-Datasheet.pdf) |
-| MQ-6 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-6.pdf) |
-| MQ-7 | Sparkfun | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf) |
-| MQ-8 | Sparkfun | [datasheet](https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Biometric/MQ-8.pdf) |
-| MQ-9 | Haoyuelectronics | [datasheet](http://www.haoyuelectronics.com/Attachment/MQ-9/MQ9.pdf) |
-| MQ-131 | Sensorsportal | [datasheet](http://www.sensorsportal.com/DOWNLOADS/MQ131.pdf) |
+| MQ-2 | HANWEI Electronics| [datasheet](https://www.pololu.com/file/0J309/MQ2.pdf) |
+| MQ-3 | HANWEI Electronics | [datasheet](https://www.sparkfun.com/datasheets/Sensors/MQ-3.pdf) |
+| MQ-4 | HANWEI Electronics | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-4.pdf) |
+| MQ-5 | HANWEI Electronics | [datasheet](https://www.parallax.com/sites/default/files/downloads/605-00009-MQ-5-Datasheet.pdf) |
+| MQ-6 | HANWEI Electronics | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-6.pdf) |
+| MQ-7 | HANWEI Electronics | [datasheet](https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf) |
+| MQ-8 | HANWEI Electronics | [datasheet](https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Biometric/MQ-8.pdf) |
+| MQ-9 | HANWEI Electronics | [datasheet](http://www.haoyuelectronics.com/Attachment/MQ-9/MQ9.pdf) |
+| MQ-131 | HANWEI Electronics | [datasheet](http://www.sensorsportal.com/DOWNLOADS/MQ131.pdf) |
 | MQ-135 | HANWEI Electronics | [datasheet](https://www.electronicoscaldas.com/datasheet/MQ-135_Hanwei.pdf) |
 | MQ-136 | HANWEI Electronics | [datasheet](https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/Datasheets/MQ136%20-%20Hanwei.pdf) |
 | MQ-303A | HANWEI Electronics | [datasheet](http://www.kosmodrom.com.ua/pdf/MQ303A.pdf) |