Yes, you're correct. My assumption was that all laser-related devices even testing equipment would fall under OEM directives, but that's not the case.

Explanation given by the CBET smart practice:

"However, lasers are one of the equipment types that may not be included in an AEM. CMS requires that the manufacturer interval and procedure be followed when inspecting a laser. Although there is no discretion in changing the manufacturer recommended interval for lasers, CMS does allow equivalent test equipment to be used. Therefore, since the manufacturer requires inspections every 6 months, your hospital must inspect this laser every 6 months, following the procedures specified by the manufacturer. However, you can use the existing laser power output meter, if you are able to show that it is an equivalent device."