The questions we would ask.

Partly, and the honest answer takes a paragraph. The controlled chamber studies (Satish 2012, Allen 2016) found substantial decrements in complex decision-making at 1,000 and 2,500 ppm. Independent replication has been inconsistent since, and a 2019 review co-authored by the original lead author is openly sceptical about direct effects below roughly 5,000 ppm. What nobody disputes is narrower: CO₂ tracks ventilation rate per occupant reliably, poor ventilation is independently associated with worse symptoms and performance, and none of it is perceptible without an instrument. The science page sets out the whole picture, the papers that undercut us included.

Because what is contested is the size of the cognitive effect, not the measurement itself. Ventilation is a real and controllable property of the room you spend nine hours a day in, and at the moment you have no visibility into it whatsoever. Even on the most sceptical reading of the literature, finding out that your closed office reaches 1,600 ppm by eleven is information you did not previously have about a room you cannot leave.

A directional figure, derived by interpolating between the exposure conditions published in Satish 2012 and anchored to their reported effect sizes on the Strategic Management Simulation measures. Its only job is to make a ppm reading legible to someone who does not spend their evenings reading indoor-air literature. It is not a clinical measurement and it is not personalised to you, and we try not to present it as either.

Three reasons, and only the last is about materials. The sensor first: a dual-channel NDIR cell with a sealed reference and pressure compensation holds its calibration over years, where a single-channel cell drifts and leans on auto-baselining to cover for it. Then the rest of the suite, because CO₂ on its own describes ventilation and says nothing about what is in the air being ventilated. And yes, it is machined aluminium with a transflective display, which is a decision about something sitting on a desk in your eyeline for the next decade rather than in a cupboard.

No. Take it out of the box, plug it in, and every sensor, the display, the alerting and two years of local history work with the radio switched off and no account anywhere. Networking gets you the app, the local API and Signal. What it is not is a licence to operate hardware you have already paid for.

There is no fan and there are no moving parts of any kind; air moves through a convective chimney path machined into the chassis. So, no.

Core runs continuous automatic baseline correction. That is enough for any space that sees outdoor air at some point in the week, and you can force a manual single-point calibration outdoors if you would rather not trust it. Pro ships calibrated against a traceable reference with a per-unit certificate, and we recalibrate those annually at cost, with a loaner unit to use while yours is with us.

Core, unless one of a few things applies. You need the reading to stand up in front of a third party; you want formaldehyde or NO₂ specifically, because of a new fit-out or a gas hob; you are on a ground floor or in a basement and ought to be measuring radon. Those are the Pro cases. If the local API was the only thing drawing you upward, stop: it is on every tier now, Core included. Otherwise the extra €300 buys precision you are unlikely to use.

Nothing at all. We take an email address and hold you a founding place: no payment, no card details, no obligation of any kind. When production is confirmed you get an email with a link to buy, and you make up your mind at that point. Ignore it and nothing whatsoever happens to you.

The Founding 500 ship in Q1 2027, in reservation order, with general availability following in Q2 2027. Hardware dates slip; if ours does, the email will lead with the new date rather than bury it in paragraph four.

The first 500 units. An engraved sequential serial on the base, the factory calibration record for that specific unit, Signal for life instead of for the first year, and first position in the shipping queue. It costs the same as a standard unit; the waitlist is just how we decide who gets offered one first.

Once units ship, yes: 60 days from delivery, full refund, return shipping included, for any reason or for none. An instrument somebody was talked into is worth very little to us. We would rather have it back, along with your honest reason for sending it.

Because it is all a waitlist actually needs, and every additional field costs us people who would genuinely have wanted one. This is a list of addresses to write to when there is something to buy, not a profile of you. Name, shipping address and payment details get collected at the point they are required, which is not today.

By default, only you; the cloud is off until you decide to switch it on. If you do enable it, data is stored in the EU and is never sold, brokered, or used to build an advertising profile. Benchmarking is opt-in and aggregated. Everything is exportable at full resolution, and the account and its data can be deleted from one screen.

It carries on working, because it never depended on us in the first place. Everything runs locally. Beyond that we have committed to publishing the local API specification, the service manual and the firmware signing tooling if we ever wind down, so that whoever wants to keep the fleet alive can. A €390 instrument that bricks when a startup fails is not an instrument, it is a subscription with a heavy case.