Features: 1) Heavy duty ALU alloy frame frost oxidized.                                                                     2) 3pcs of acrylic vial indicate level, plumb and 45o                                                                            3) Accuracy 0.029o=0.5mm/m based on main datum plane and 0.057o=1mm/mon opposite datum plane4) With strong magnet, ABS plastic parts shockproof                                                                         

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