Within each set are all the chemicals needed for a particular Key Stage, provided in either 50ml or 50gm bottles or vials, sufficient for approximately 100 determinations. One of the major benefits of the system is that due to the small quantities used, there is potential to save around 90% on a typical school consumables budget. The risk of serious injury is reduced dramatically and waste disposal becomes much less of a threat to the environment. Health and Safety CD & Booklet included.