A gift that sat on the shelf for years. Note the knobs are identical to the Voltohmyst 98C. A pleasant little project and it works fine.
Lots and lots and lots of cleaning of the function and range swithces. Better. But still impossible to get consistant steady signals or repeatable adjustment. R2-R3 dual pot is not sealed construction and spray cleaned it multiple times. Finally pulled the R2-R3 dual pot from the pcb and opened up to clean. That did the trick. New C4 improved operation too.