Features: Easy to operate with a clear LCD display and clear entity buttons. Double line LCD display, key clear. Supports multiple functions such as reading parameters, setting parameters, fault codes, input/output signals, etc. This blue test tool (T / T) is omnipotent version with unlimited times, which can check and adjust GECB data Application Models: Universal Fit for Otis and Xizi Otis Elevator Device Test Part Number: GAA21750AK3 Material: plastic colour: blue Package Contents: 3 x electric tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.