spirit level 1.aluminum alloy frame 2.accurate calibration 3.level bubble indicate level spirit level MaterialAluminum alloy frameUseAccurate calibration Working principleLevel bubble indicate levelMagnetism Magnetic bottomColourCustomer demand Delivery time45daysPayment termsT/T,L/CSize30cm/12",40cm/16",50cm/20",60cm/24",80cm/32",100cm/40",120cm/48",150cm/60"