M-D Building Products 92288 SmartTool Levels M-D Building Products 92288 SmartTool Levels Features:; SmartTool " digitally displays degrees, percent slope, and pitch to 1/10 º accuracy; Extremely durable, it will keep its accuracy for years with push button calibration; Features audio sound at level and plumb; Includes standard 9 volt battery; 92288: 24" sensor module in a 60CM rail; 92296: 48" sensor module in a 120CM rail