Detection Methane Smoke Liquefied Gas Sensor Module MQ-135 MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 for Arduino Starter DIY Kit
$2.52
Today it costs $2.52 on AliExpress. Since Oct 22, 2026, when we started tracking it, the price hasn't changed. We haven't tracked it long enough yet to say whether it's on sale.
We have tracked this product for less than a day; confirming a drop takes at least 3 days. The store advertises "was $3.36", but that is the store's own claim; we only state discounts our price history proves.
View on AliExpressAffiliate link: we earn a commission on completed purchases, and the price is the same with or without our code. The price above is the last recorded reading, not a live checkout lookup.
Price history
$2.52
We started tracking this price on Oct 22. The chart takes shape over the days: we only draw prices we observed.
| Store | Relax Goal DIY Electronic Store |
|---|---|
| Product rating | — |
| Store rating | — |
| AliExpress category | Electronic Components & Supplies › Active Components |
| Recorded readings | 1 |
| First seen | 10/22/2026 |
| Last reading | 10/22/2026, 3:43:18 PM UTC |