Hello. Occupational Therapy in my area no longer provide you with anything for free (unless it's something the size of a walk-in shower) so I've been buying my own disability aids and appurtenances. I've been trying to buy as many as possible second-hand to save the planet but I'm wondering if I'm taking it too far. Like, is it sensible to buy a second-hand peak flow meter? Could that be insanitary?