Headpace vials sune abubuwan da suka dace da kullun a cikin gwaje-gwajen gas. Headpace vials suna da bayanai daban-daban na iya bambanta, gami da 6ml, 10ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, 20ml, da sauransu suna amfani da daidaitaccen samfurin VIAL don tabbatar da daidaitaccen samfurin. Yawancin lokaci, ƙarar da ya dace ya zama aƙalla 50% na girman samfurin.