This is probably best rephrased as an "Ask HN:". The -20C to 150C existing range is instructive- you don't need to hit both your extremes, merely occasionally

This is probably best rephrased as an "Ask HN:". The -20C to 150C existing range is instructive- you don't need to hit both your extremes, merely occasionally deviate past those extremes. -20C for instance occurs throughout the world, so any outdoor vehicle or asset rental tag would benefit from a hardier version. If the RFID tag can employ a bit of logic (it's dipped below 140 C, or above -10 C and that's only when it emits, for example) then the world is replete with applications in the food service and manufacturing industries. Yup. Freezer alarm beacons are your bread and butter with this technology, but only if you can put some signal to them. I'd consider instead of touting your larger gamut of temperatures, developing technology to tune predictable failures (and perhaps permanent ones) at bespoke temperatures. It'd be very handy to scan a pallet of eggs and know that the -1.4C threshold had been crossed, with frost damage a likely result. Reach out to me directly if you want some US engineering support- know a startup in the food service industry that has a market for this kind of stuff.