Hey Timmy
I thought i would step up and give you my experience. I have a specta physics 1252 or something like that. They don't make it anymore, but it is a pretty good unit compared to what is available now. I use is pretty much every day, for survey work, and for grade control
Shop around and compare specs on many different units. You will find the range and accuracy vary greatly.
Depending on what you are doing range may be important. Drainage jobs need long range. That unit you are looking at is only has 1000' of range(the specs say 2000' DIAMETER) That isn't far when you get out on a tile or ditch project. For housing project work it may be fine. Depends what you are doing. And how often you want to move the laser.
Accuracy is critical too. Compare specs since i don't know these as well. But at long ranges a little bit of inaccuracy can get pretty big. And if you are trying to get to +-.05 you will find yourself in trouble.
The remote is nice so you can place the laser on an elevating tripod and raise it way up in the air, out of reach of your hands.
The slope graduations need to be fine. My minimum slope is .1% ( 1' in 1000') For drainage work, that can be a bit steep. Some ditches need to be flatter than that.
I haven't found a use for dual slope yet, but can imagine it might be good for setting the crown on a road, parking lot, runway. I imagine if you are using a grader with two receivers, the dual slope might be handy.
As far as recievers go, just about anything will do. The bigger the window the better. The bigger the magnets the better.
I have got really good service from my local topcon guy. They will get my next purchase. They handle all the service work too, so it's pretty handy.
