Professional digital level. Advantages: Plumbside peephole for comfortable vertical measuring. MEMS technology (Micro-Electro-Mechanical Systems) Waterproof case. Functions: LCD with lighting Hold function 360 degree, comfortable reading, display indications are reversed when turned upside down. MODE (selection) function (degrees, percent) MEMORY RECALL (saving memory) up to 9 values RECALIBRATION (calibration function) and "fake zero" function BUZZER (alarm at 0, 45 and 90 degrees) Battery indicator. Digital accuracy: 0.1 degree