Please refer to my thread on Nepenthes TC. A loop is for manipulating seeds/sprouts and can be used in lieu of tweezers which can be frustrating in some instances when the seeds stick. There are ones that are made of metal so that one can reuse them by flaming/autoclaving or there are the plastic disposables that have been gamma irradiated and intended for one time use. You might want to the look for a local "freecycle" mailing list as that is where I procured my baby jars from. As for the PPM, the patent is in the public domain.
Send me a PM with your address and I will gather some stuff for you. Let me know if you want the MS media or not. If so, do you want me to preweigh out some samples for some specified amount (ex. 100ml recipe..etc).