Oops--Broke Another One

Terry is a graduate student in Professor Young's lab. Terry's research project requires use of delicate optical instrumentation. In the past year, Terry broke a notch filter and a dichroic mirror while handling them. Each of these components costs about $500. After the second breakage, Professor Young warned Terry that he has limited grant funds and cannot continue to replace expensive optical components. Last week Terry was having a bad time and broke another notch filter.

What can/should Professor Young do?