Robot/Reflectorless Opinion

Robot hardware pretty much identical, plus your probably looking at a zoom95 which is nearly the same but with bigger screen onboard and faster processor as zoom90 has been replaced. I'd be asking myself which dealer I was buying from will have the best support. I've got a zoom 90 but running it with XPAD which is much nicer to use that SurvPC but depends if your using GNSS that needs SurvPC.

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Assuming you will save some $$ with the geomax so appears a no brainer. As your probably aware Carlson also sell the geomax robots with their stickers on them.

Definitely Zoom 90/95 which is in fact a TS15. You can use SurvCE/PC, Fieldgenius and Xpad with it. Great tracking and repeatable results with their ATR. Radio range is over 300m line of sight with the radio handle.