Can the RG 150 be used on walls with a counter balancer?

Yes. The RG 150 is recommended as a grinder for walls.

We recommend the RG 150 for use on walls with the appropriate wheel suitable for the application plus the optional accessory counter balancer (p/n 769121) - for secure and easy guidance and counter-balancing when using the
RG 150 in a vertical position on walls.