I don’t know if it’s the way toy companies have evolved since the 1980s or it’s my perception of companies as a toy collector. Kenner could have easily sold the P.K.E Meter™ separately. Fortunately for kids they didn’t.
The Ecto-Goggles™ are another example of how cool Kenner was in the ‘80s. Like my earlier perception Kenner could have just sold them separately. They included a miniature rubber version of the nutrona wand called the Ecto-Popper.™ Which was somewhat similar to the Ghostpopper.™