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lets talk about prisms prisms is generally targets that you look for through the turtle station you center your crosses in the middle and to the sides as you can see theres downward arrows so use that as indication of where to put your downward arrow as well as your crosshair then another type of target is just a normal reflective sheet target this youll put up on a high wall on bridges its something that you can come back to continuously and measure the exact same point for monitoring a bridge for example so you get different types of prisms for different types of applications as you can see our current prism that we have here is set to a -30 offset but when we look at the other side its got a zero millimeter offset so each prism has got different offsets on different size so always make sure that you know what is the constant to be able to put it into your total station welcome to another turtle station theory session in todays video well talk more about prism constants so how