Patent ID: 8826980

Claim:
A first wellbore servicing apparatus comprising: a housing, the housing defining an axial flowbore and comprising one or more ports providing a route of fluid communication between the axial flowbore and an exterior of the housing; a first sliding sleeve, the first sliding sleeve being movable from a first position to a second position; a second sliding sleeve, the second sliding sleeve being movable from a first position to a second position; a chamber, the chamber being at least partially defined by the housing; and an indicator, wherein the indicator is disposed within the chamber, wherein, when the first sliding sleeve is in the first position, the ports are obstructed by the first sliding sleeve and the second sliding sleeve is retained in the first position by the first sleeve and, when the first sliding sleeve is in the second position, the ports are unobstructed by the first sliding sleeve and the second sliding sleeve is not retained in the first position by the first sleeve, and wherein, when the second sliding sleeve is in the first position, the indicator is retained within the chamber and, when the second sliding sleeve is in the second position, the indicator is not retained in the chamber.