This was a reactive pearl piece that many used in the mid-1990s. The late Dave D'Entremont made a lot of money out on tour using a Sensor II.
According to 123.bowl.com, it had a 2.54 RG and .023 differential and was for medium to medium light oil volumes. I suppose that would be true for the time, considering oil volumes were one-third of what is currently used.
Does anyone remember this piece? Does anyone still have one and use it?