Our Seven series benchtop meters have IP54 rating. IP stands for 'Ingress Protection'. An IP number is used to specify the environmental protection of enclosures around electronic equipment. These ratings are determined by specific tests. The IP number is composed of two numbers, the first referring to the protection against solid objects and the second against liquids. The higher the number, the better the protection, for example: 5-Protected against dust, limited ingress (no harmful deposit) 4-Protection against water sprayed from all directions - limited ingress permitted