Looks good enought to me, and cheeper than a lot of places. Do you need to have an account with them or can you just order them as a one off? One thing to do when you have actually bought your thermometer is to check it. You can do this by borrowing another thermometer from a freind for a couple of hours and placing both probes in the same place but in differnt situations ( i.e get ambaint room temp from both thermometers then put in heated viv and wait a bit, then compare readings. Effectivly you are calibrating them against each other.