diff --git a/README.md b/README.md
index c5465db..8e65353 100644
--- a/README.md
+++ b/README.md
@@ -507,6 +507,47 @@ You'll need Arduino desftop app 1.8.9 or later.
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+ MQ303A - HANWEI |
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+ -2.3543 |
+ 1.144 |
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MQ309A - HANWEI |
-2.1311 |