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166            <div class="row align-items-center g-4">
167                <div class="col-lg-8">
168                    <h1 class="display-4 fw-bold">Air Quality Monitors and CO2 Sensors</h1>
169                    <div class="provenance-note">
170                        <i class="bi bi-geo-alt-fill" aria-hidden="true"></i>
171                        <div><strong>Engineered, assembled and tested in Québec, Canada.</strong><small>Shipped from Canada to customers across Canada, the United States, and worldwide.</small></div>
172                    </div>
173                    <p class="lead mb-4">Choose a VisiblAir monitor for quick CO2 checks, continuous indoor measurements, building-scale deployments, or outdoor air quality tracking.</p>
174                    <div class="d-flex flex-wrap gap-2">
175                        <a class="btn btn-light btn-lg" href="#product-finder">Find my monitor</a>
176                        <a class="btn btn-outline-light btn-lg" href="/compare.html">Compare every model</a>
177                    </div>
178                </div>
179                <div class="col-lg-4 text-center">
180                    <img src="/images/products/photography/model-e-lite-primary-480.webp" class="img-fluid" width="480" height="480" alt="VisiblAir Model E-Lite connected indoor air quality monitor">
181                </div>
182            </div>
183        </div>
184    </header>
185
186        <nav class="use-case-nav py-3" aria-label="Choose products by need">
187            <div class="container use-case-nav__links">
188                <strong>Shop by need:</strong>
189                <a href="#product-finder" data-finder-environment="indoor" data-finder-goal="portable">Portable CO2 checks</a>
190                <a href="#product-finder" data-finder-environment="indoor" data-finder-goal="continuous">Connected indoor monitoring</a>
191                <a href="#product-finder" data-finder-environment="indoor" data-finder-goal="building">Multi-room and building monitoring</a>
192                <a href="#product-finder" data-finder-environment="outdoor" data-finder-goal="continuous">Outdoor monitoring</a>
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201                            <p class="eyebrow mb-2">Product finder</p>
202                            <h2>Start with what you need to do</h2>
203                            <p class="lead mb-0">Answer three short questions. The finder uses only current product capabilities and availability, and collects no personal information.</p>
204                        </div>
205                        <div class="col-lg-4 text-lg-end"><a href="/compare.html">Skip to the complete comparison</a></div>
206                    </div>
207                    <div class="finder-questions">
208                        <fieldset class="finder-question"><legend>1. Where will you measure?</legend><label class="finder-option"><input type="radio" name="finder-environment" value="indoor" required> Indoors</label><label class="finder-option"><input type="radio" name="finder-environment" value="outdoor" required> Outdoors, exposed to weather</label></fieldset>
209                        <fieldset class="finder-question"><legend>2. How will you use it?</legend><label class="finder-option"><input type="radio" name="finder-goal" value="portable" required> Move it around for quick checks</label><label class="finder-option"><input type="radio" name="finder-goal" value="continuous" required> Monitor one room continuously</label><label class="finder-option"><input type="radio" name="finder-goal" value="building" required> Equip several rooms or a building</label></fieldset>
210                        <fieldset class="finder-question"><legend>3. What matters most?</legend><label class="finder-option"><input type="radio" name="finder-priority" value="simple" required> Simple CO2 readings</label><label class="finder-option"><input type="radio" name="finder-priority" value="broad" required> CO2, particles, and VOC trends</label><label class="finder-option"><input type="radio" name="finder-priority" value="infrastructure" required> Wired power/network or remote access</label></fieldset>
211                    </div>
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213                    <div class="finder-result" data-finder-result tabindex="-1" hidden></div>
214                </form>
215                <p class="mt-3 mb-0">Interested in particulate matter, temperature, humidity, and pressure? <a href="/products/model-x3.html">Explore Model X3</a> and its pre-production preorder options.</p>
216                <div class="d-flex flex-wrap gap-3 mt-4">
217                    <a href="/solutions/school-classroom-co2-monitoring/">Planning for a school or classroom?</a>
218                    <a href="/solutions/office-commercial-building-co2-monitoring/">Planning for an office or commercial building?</a>
219                    <a href="/quote.html" data-quote-entry>Request a multi-unit quote</a>
220                    <a href="/how-to.html">Documentation and setup</a>
221                    <a href="/contact.html">Product support</a>
222                </div>
223            </div>
224        </section>
225
226        <section class="py-5 bg-light" id="catalogue">
227            <div class="container">
228                <div class="row mb-4">
229                    <div class="col-lg-8">
230                        <h2>VisiblAir models</h2>
231                        <p class="lead">Prices shown are in Canadian dollars. Open a model to review its published measurements and ordering information.</p>
232                    </div>
233                </div>
234                <div class="row g-4">
235                    <div class="col-md-6 col-xl-4">
236                        <article class="card product-card catalogue-card h-100 shadow-sm">
237                            <img src="/images/products/photography/model-c-primary-480.webp" class="card-img-top" width="480" height="480" alt="VisiblAir Model C smart CO2 sensor">
238                            <div class="card-body d-flex flex-column">
239                                <span class="badge text-bg-success mb-3">Available</span>
240                                <h3 class="h4 card-title">Model C</h3>
241                                <p class="fw-semibold">Smart CO2 sensor</p>
242                                <p class="card-text">Connected CO2, temperature, and humidity monitoring with Wi-Fi, a readable display, local storage, and cloud portal access.</p>
243                                <dl class="catalogue-cues"><div><dt>Best for</dt><dd>Connected CO2 rooms</dd></div><div><dt>Measures</dt><dd>CO2, temperature, humidity</dd></div><div><dt>Power / connection</dt><dd>USB-C battery · Wi-Fi</dd></div><div><dt>Cloud</dt><dd>Yes; local storage too</dd></div></dl>
244                                <p class="card-text fw-bold mt-auto"><small>Starting at</small> $209 CAD</p>
245                                <a href="/products/model-c.html" class="btn btn-primary">View Model C</a>
246                            </div>
247                        </article>
248                    </div>
249                    <div class="col-md-6 col-xl-4">
250                        <article class="card product-card catalogue-card h-100 shadow-sm">
251                            <img src="/images/products/photography/model-d-primary-480.webp" class="card-img-top" width="480" height="480" alt="VisiblAir Model D battery-powered CO2 monitor">
252                            <div class="card-body d-flex flex-column">
253                                <span class="badge text-bg-success mb-3">Available</span>
254                                <h3 class="h4 card-title">Model D</h3>
255                                <p class="fw-semibold">Battery-powered CO2 monitor</p>
256                                <p class="card-text">Portable CO2, temperature, and humidity spot checks with an integrated battery and local CSV data logging—no Wi-Fi required.</p>
257                                <dl class="catalogue-cues"><div><dt>Best for</dt><dd>Portable checks</dd></div><div><dt>Measures</dt><dd>CO2, temperature, humidity</dd></div><div><dt>Power / connection</dt><dd>USB-C battery · local USB</dd></div><div><dt>Cloud</dt><dd>No; CSV log</dd></div></dl>
258                                <p class="card-text fw-bold mt-auto">$199 CAD</p>
259                                <a href="/products/model-d.html" class="btn btn-primary">View Model D</a>
260                            </div>
261                        </article>
262                    </div>
263                    <div class="col-md-6 col-xl-4">
264                        <article class="card product-card catalogue-card h-100 shadow-sm">
265                            <img src="/images/products/photography/model-e-lite-primary-480.webp" class="card-img-top" width="480" height="480" alt="VisiblAir Model E-Lite connected air quality monitor">
266                            <div class="card-body d-flex flex-column">
267                                <span class="badge text-bg-success mb-3">Available</span>
268                                <h3 class="h4 card-title">Model E-Lite</h3>
269                                <p class="fw-semibold">Connected indoor air quality monitor</p>
270                                <p class="card-text">Track CO2, PM2.5, VOC, temperature, humidity, and pressure with Wi-Fi connectivity and cloud history.</p>
271                                <dl class="catalogue-cues"><div><dt>Best for</dt><dd>Indoor air trends</dd></div><div><dt>Measures</dt><dd>CO2, PM, VOC, temp., humidity, pressure</dd></div><div><dt>Power / connection</dt><dd>USB-C · Wi-Fi</dd></div><div><dt>Cloud</dt><dd>Yes</dd></div></dl>
272                                <p class="card-text fw-bold mt-auto"><small>Starting at</small> $285 CAD</p>
273                                <a href="/products/model-e-lite.html" class="btn btn-primary">View Model E-Lite</a>
274                            </div>
275                        </article>
276                    </div>
277                    <div class="col-md-6 col-xl-4">
278                        <article class="card product-card catalogue-card h-100 shadow-sm">
279                            <img src="/images/products/photography/model-o-primary-480.webp" class="card-img-top" width="480" height="480" alt="VisiblAir Model O PoE-ready multi-sensor air quality monitor">
280                            <div class="card-body d-flex flex-column">
281                                <span class="badge text-bg-success mb-3">Available</span>
282                                <h3 class="h4 card-title">Model O</h3>
283                                <p class="fw-semibold">PoE-ready multi-sensor monitor</p>
284                                <p class="card-text">Building-ready monitoring for CO2, particulate matter, VOC, NOx, temperature, humidity, and pressure with Ethernet and Wi-Fi.</p>
285                                <dl class="catalogue-cues"><div><dt>Best for</dt><dd>Rooms and buildings</dd></div><div><dt>Measures</dt><dd>CO2, PM, VOC, NOx, temp., humidity, pressure</dd></div><div><dt>Power / connection</dt><dd>USB-C or PoE · Wi-Fi/Ethernet</dd></div><div><dt>Cloud</dt><dd>Yes</dd></div></dl>
286                                <p class="card-text fw-bold mt-auto"><small>Starting at</small> $289 CAD</p>
287                                <a href="/products/model-o.html" class="btn btn-primary">View Model O</a>
288                            </div>
289                        </article>
290                    </div>
291                    <div class="col-md-6 col-xl-4">
292                        <article class="card product-card catalogue-card h-100 shadow-sm">
293                            <img src="/images/products/photography/model-x2-primary-480.webp" class="card-img-top" width="480" height="480" alt="VisiblAir Model X2 outdoor air quality sensor">
294                            <div class="card-body d-flex flex-column">
295                                <span class="badge text-bg-success mb-3">Available</span>
296                                <h3 class="h4 card-title">Model X2</h3>
297                                <p class="fw-semibold">Outdoor air quality sensor</p>
298                                <p class="card-text">Weather-exposed monitoring for particulate matter, VOC, temperature, humidity, and optional CO2 with remote cloud access.</p>
299                                <dl class="catalogue-cues"><div><dt>Best for</dt><dd>Outdoor deployments</dd></div><div><dt>Measures</dt><dd>PM, VOC, temp., humidity; optional CO2</dd></div><div><dt>Power / connection</dt><dd>USB-C · Wi-Fi or LTE</dd></div><div><dt>Cloud</dt><dd>Yes</dd></div></dl>
300                                <p class="card-text fw-bold mt-auto"><small>Starting at</small> $249 CAD</p>
301                                <a href="/products/model-x2.html" class="btn btn-primary">View Model X2</a>
302                            </div>
303                        </article>
304                    </div>
305                    <div class="col-md-6 col-xl-4">
306                        <article class="card product-card catalogue-card h-100 shadow-sm">
307                            <img src="/images/products/model-x3-preproduction-primary.png" class="card-img-top" width="1088" height="1445" alt="Soft-focus white pre-production Model X3 enclosure">
308                            <div class="card-body d-flex flex-column">
309                                <span class="badge text-bg-secondary mb-3">Pre-production preorder</span>
310                                <h3 class="h4 card-title">Model X3</h3>
311                                <p class="fw-semibold">PM and ambient conditions sensor</p>
312                                <p class="card-text">Tera NextPM particulate sensing with temperature, humidity, and pressure.</p>
313                                <dl class="catalogue-cues"><div><dt>Measures</dt><dd>PM, temperature, humidity, pressure</dd></div><div><dt>Power / connection</dt><dd>Optional USB-C supply · Wi-Fi or LTE</dd></div></dl>
314                                <p class="card-text fw-bold mt-auto">Preorder from $375 CAD <small class="d-block fw-normal">Regular base price: $460 CAD · Shipping estimated to start late October 2026</small></p>
315                                <a href="/products/model-x3.html" class="btn btn-primary">Reserve your X3</a>
316                            </div>
317                        </article>
318                    </div>
319                    <div class="col-md-6 col-xl-4">
320                        <aside class="card h-100 border-primary bg-light">
321                            <div class="card-body d-flex flex-column justify-content-center">
322                                <i class="bi bi-building fs-1 text-primary mb-3" aria-hidden="true"></i>
323                                <h3 class="h4">Planning several monitors?</h3>
324                                <p>Tell us about your school, office, commercial building, or multi-site deployment. We can help select the right sensors and prepare a quote.</p>
325                                <a href="mailto:[email protected]?subject=VisiblAir%20multi-unit%20quote" class="btn btn-outline-primary">Request a quote</a>
326                            </div>
327                        </aside>
328                    </div>
329                </div>
330                <div class="alert alert-secondary mt-4 mb-0">
331                    <strong>Looking for Model F?</strong> Model F is end of life while its replacement is redesigned. For portable battery-powered CO2 checks, see <a href="/products/model-d.html" class="alert-link">Model D</a>.
332                </div>
333            </div>
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335
336        <section class="py-5 bg-light">
337            <div class="container">
338                <div class="row align-items-center g-4">
339                    <div class="col-lg-7">
340                        <h2>Not sure which monitor fits?</h2>
341                        <p class="lead">Compare sensor measurements, power, connectivity, data storage, cloud access, prices, and availability side by side.</p>
342                    </div>
343                    <div class="col-lg-5 d-flex flex-wrap gap-2 justify-content-lg-end">
344                        <a href="/compare.html" class="btn btn-primary btn-lg">Compare models</a>
345                        <a href="/faq.html" class="btn btn-outline-primary btn-lg">Read the FAQ</a>
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