Hi! I have a standard peakflow meter, which i don't want to be without. However, i will be flying to Dublin in May and i am aware that some airlines don't want you to pack it in hand luggage. To book luggage into hold will more that double my cost. I will contact Ryanair's customer service, but in the meantime does anyone know if there are any smaller reliable peakflow meters, other than the usual Wright's? Something I can pack in hand luggage.