Features: Easy to operate with a clear LCD display and clearly labeled buttons. Double-line LCD display, key clarity. Supports multiple functions such as reading parameters, setting parameters, fault code detection, input/output signal testing, and more. This blue test tool is an enhanced version with unlimited usage, capable of checking and adjusting GECB data. Application Models: Compatible with universal elevator devices and Xizi elevator system testers. Part Number: GAA21750AK3 Material: Plastic Color: Blue Package Contents: 1 x Electric Tester Note: Only the items listed above are included. Other accessories or products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance: +/- 1-3 cm.