Device enabling the measurement the bioadhesiveness of a mucoadhesive preparation in semi-pasty form, of the type of that comprising: - at least one biological membrane, - a surface suitable for inclination by 45° or more for inclining one biological membrane according to the viscosity of the mucoadhesive preparation, after a waiting time required to stabilise the deposit of a sample thereof, - and a system for timing the flow time of the mucoadhesive preparation sample in order to record the the flow time thereof on the biological membrane, characterised in that it consists of: * a climatic chamber wherein are deposited: - one biological reference membrane impregnated with water or buffer solution, - and one biological measurement membrane impregnated with a solution consisting of a biological constituent so that the measurement membrane remains coated with a fluid film without there being any flow therefrom, these two membranes of cellulose or cellulose esters other than nitrocellulose being bound with a graduated metal or plastic support plate associated with a surface suitable for inclination so as to deposit a sample of the same mucoadhesive preparation under test on both biological membranes, * temperature control means of the climatic chamber based on the products tested, * a system for injecting the preparation under test, * a system for timing the flow time of each sample injected, * and a system for calculating the bioadhesiveness factor represented by a difference in flow time between the membrane impregnated by the biological constituent and the reference membrane. - at least one biological membrane, - a surface suitable for inclination by 45° or more for inclining one biological membrane according to the viscosity of the mucoadhesive preparation, after a waiting time required to stabilise the deposit of a sample thereof, - and a system for timing the flow time of the mucoadhesive preparation sample in order to record the the flow time thereof on the biological membrane, characterised in that it consists of: * a climatic chamber wherein are deposited: - one biological reference membrane impregnated with water or buffer solution, - and one biological measurement membrane impregnated with a solution consisting of a biological constituent so that the measurement membrane remains coated with a fluid film without there being any flow therefrom, these two membranes of cellulose or cellulose esters other than nitrocellulose being bound with a graduated metal or plastic support plate associated with a surface suitable for inclination so as to deposit a sample of the same mucoadhesive preparation under test on both biological membranes, * temperature control means of the climatic chamber based on the products tested, * a system for injecting the preparation under test, * a system for timing the flow time of each sample injected, * and a system for calculating the bioadhesiveness factor represented by a difference in flow time between the membrane impregnated by the biological constituent and the reference membrane. * a climatic chamber wherein are deposited: - one biological reference membrane impregnated with water or buffer solution, - and one biological measurement membrane impregnated with a solution consisting of a biological constituent so that the measurement membrane remains coated with a fluid film without there being any flow therefrom, these two membranes of cellulose or cellulose esters other than nitrocellulose being bound with a graduated metal or plastic support plate associated with a surface suitable for inclination so as to deposit a sample of the same mucoadhesive preparation under test on both biological membranes, - one biological reference membrane impregnated with water or buffer solution, - and one biological measurement membrane impregnated with a solution consisting of a biological constituent so that the measurement membrane remains coated with a fluid film without there being any flow therefrom, * temperature control means of the climatic chamber based on the products tested, * a system for injecting the preparation under test, * a system for timing the flow time of each sample injected, * and a system for calculating the bioadhesiveness factor represented by a difference in flow time between the membrane impregnated by the biological constituent and the reference membrane.