Questions on the old Geodimeter stations?

bob james, post: 390228, member: 12050 wrote: 1. Why are the 600 series so popular? It seems they command much more than other models, even if robotic?

The 600 series was the end of the line for the Geodimeter marque. Trimble bought Geodimeter and rebranded the series with the Trimble 5600 name.

2. If you have a robotic Geodimeter, can any of their active targets work or is there only 1 target for each model?

I think any 600-series or 5600-series target will work with any 600-series gun.

3. I notice a few different models with different CUs. Are these somehow interchangeable?

I think all the 600-series CUs will work, and probably most if not all of the 5600 CUs. But I've not done any testing to verify.