The Stabila 36524 24" Tech/Electronic IP65 level, features electronic measuring technology, two digital displays, an audible inclination guide, IP 65 dust and waterproof housing, and removable shock-absorbing end caps with anti-slip wall grips. Precise slope measurements as needed for ADA 4.8.2 handicap ramp compliance. Dual screens (front & top) allow easy viewing from any angle. Electronic displays illuminate for easy viewing in low light conditions, and includes 5 display modes (degrees in 1 or 2 decimal points, percent, feet & inches (rise/run) in decimal, feet & inches in fractions and mm/m). Other features include instant measurement conversion to any scale (rise & run to degrees, degrees to percent, etc...), audible tones for sight free use, one button calibration and carrying case. Requires two AA batteries for operation.