the injectors you speak of are quite handy sometimes... However they live up to the term disposable. They are known to stick this can cause sudden movement while pushing or pulling, which in turn knocks thing around or splashes this or that...Point is they can be handy, just keep in mind most np's will cause the sticking to begin, and the plunger is rubber which means it will be eaten by the candy. Always be sure to secure your apparatus and try to hold the injector like a flashlight, working the plunger with the thumb. Resist the temtation to get your eyes to close in case of splash. Goggles are worth there weight in gold to protect the eyes. Blah Blah, I do ramble!
As for the thermom. Since the probe is metal you know thw drill. Calibrate in boiling h20 to mark varience. Swim has 2, one with the metal casing removed from the probe...
to be attatched to bottom of flask for temp reading durring convection heating or when a temp is needed for a weird position. If using for a oil bath a glass candy thermom would be better, doesn't quit on you when splashed or dropped in the oil. If it does get wet or oily inside, pop it open and clean it with q-tips...they are somtime expensive but have been invaluable in many aplications (ghetto).
Edit: After re reading this i'm sorry if it sounds condescending, it's just that swiws has made plenty of mistakes and careless mishaps and if possible would share this to keep others from accidents as well.