How to make mini-clinostats for less than £5 each using them to investigate geotropism and gravitropism Years 6 to 8 STEM, GCSE , A level project. Mini-clinostsats are home made from battery powered simple clock mechanisms and empty pickle tray pots, suitable for cress or mustard seeds. Included are instructions, on how to make the mini-clinostats. Teacher-tech guides, some sample investigations with results, suggested further investigations and student instructions sheets.