Hi could look at thermometersdirect.com to get an idea.. you can pay from a few ££ up to £50 - £60 for a calibrated one. The one for around £10 is good, waterproof, suitable for laboratory use etc, and accurate to within +/- 1degree between -30 and 150 and just does what it says on the tin, no...
Hi, a while ago I was helping do a bathroom suite.. This had dark plastic supply pipes not standard 15mm stuff. Outside diameter slightly larger than copper..
Anyway took a piece of this unusual plastic down to plumb center where they recognised it as something once used by the council...