Your greenhouse is sitting at 38 degrees and you don't know until you walk outside. Or your office feels stuffy and dry but nobody's sure why. This Jaycar unit kills that guesswork. The large LCD receiver sits on your desk and pulls readings from a separate outdoor sensor up to 100 metres away (line of sight). You get indoor and outdoor temperature, indoor relative humidity, max/min records, and the time of day — all on one screen. It handles up to three sensors (sold separately, part XC0324), so you can cover the greenhouse, the workshop, and the back office from a single base unit. If your environment is temperature or humidity sensitive — museum storage, a seedling tray, a home office that's been too dry all winter — this is the straightforward fix. No app to pair, no subscription. Plug in, hang the sensor, read the numbers
