The SitePro 1300 tribrach is a Euro-style design with high-precision, smooth locking mechanism with secure motion foot screws. Features laser plummet for easy, accuracy alignment. Features Circular vial with 8-minute sensitivity Precise alignment of support cavity to the 5/8-11 threaded base plate assures accurate centering of instrument Laser plummet - accuracy 0.5mm - 15m Push-button switch located close to body prevents accidental turning on CR2 lithium battery (included) provides 10 hours of continuous operation Does not accept Trimble S7 series robot