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Chemical Sensors Philippines: Gas, Air Quality, pH/EC & Water Quality | Circuitrocks .crx-scope{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:#222;line-height:1.6} .crx-scope h2{font-size:1.6rem;margin:0 0 .25rem} .crx-scope h3{font-size:1.1rem;margin:.75rem 0 .35rem} .crx-scope p{margin:.4rem 0} .crx-scope .lead{font-size:1.05rem} .crx-scope .section{margin:1.1rem 0} .crx-scope .grid{display:grid;gap:.9rem} .crx-scope .cols-2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))} .crx-scope .cols-3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))} .crx-scope .card{background:#fff;border:1px solid #eee;border-radius:12px;padding:1rem} .crx-scope ul{margin:.25rem 0 .6rem 1.15rem} .crx-scope a{color:#15803d;text-decoration:none;border-bottom:1px dashed #9ae6b4} .crx-scope .pill{display:inline-block;background:#e8f5ee;color:#1d7f3f;font-weight:700;padding:.25rem .6rem;border-radius:999px;margin:.25rem 0} .crx-scope .faq-list details{border:1px solid #eee;border-radius:10px;padding:.7rem .9rem;margin:.45rem 0;background:#fff} .crx-scope .faq-list summary{cursor:pointer;font-weight:700} .crx-scope .muted{color:#666} .crx-scope .note{background:#fff8e6;border:1px solid #ffe1a1;border-radius:10px;padding:.7rem} Chemical Sensors at Circuitrocks — Gas, Air & Water Quality Monitoring Build reliable environmental monitors with chemical sensors for gases (CO, LPG, smoke, alcohol), air quality (VOC/CO₂/PM), and water chemistry (pH, EC/TDS, ORP, DO, salinity). Compatible with Arduino , ESP32 , and Raspberry Pi . Gas (MQ series) • VOC/CO₂/PM • pH/EC/ORP/DO • TDS & Ammonia • I²C/UART/Analog Why choose these sensors Wide coverage from hobby gas detectors to lab-grade water probes Easy integration via I²C/UART/analog with rich libraries Scalable for classrooms, farms, aquaculture, and industry pilots What you can build Indoor air-quality dashboards (CO₂/VOC/PM) Hydroponics & aquarium controllers (pH, EC, DO) Gas leak/smoke/alcoh