Device and method for indicating the condition of tubes on a tubesheet

A method for visually indicating a condition of a tube, comprising the steps of:

• inserting a device into the tube, said device including an indicator visible from outside the tube that indicates a first tube condition;
• and then
• changing the indicator on the device to indicate a second tube condition;
• wherein said device includes a head portion having a larger outside diameter than the inside diameter of the tube, and a stem portion, having a smaller outside diameter than the inside diameter of the tube, with said indicator being on said head portion, wherein the step of inserting the device into the tube includes inserting the stem portion into the tube with the head portion remaining outside of the tube;
• and further including the step of wedging at least a part of the stem portion against the tube;
• wherein said wedging step includes the step of expanding said stem portion after it has been inserted into the tube.