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https://www.dfrobot.com/product-686.html https://www.dfrobot.com/product-686.html > MQ7 datasheet > "Its service life can reach 5 years under using condition."
by p1mrx 3y ago
https://www.dfrobot.com/product-686.html https://www.dfrobot.com/product-686.html > MQ7 datasheet > "Its service life can reach 5 years under using condition."