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The Extech CO100 is a compact battery-powered weather station that shows indoor and outdoor temperature and humidity on a monochrome LCD with a backlight. A wireless sensor feeds the outdoor readings, and the unit adds a forecast icon, clock, alarm and date display. It is a simple, low-cost way to track room and yard conditions, but it lacks the barometric pressure, color display and app connectivity that pricier stations offer. It suits people who want basic temperature and humidity at a glance without setup fuss.
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Lowest price we've seen: $388.28 on Nov 10 at Newark. Tracked across 1 store since Nov 10.
Owner feedback on the CO100 is limited, but the pattern is that it does the basics well: easy setup, readable display and reliable indoor/outdoor readings. Buyers who expected pressure data or a smarter display come away disappointed.