岳把我用嘴含进满足我视频,国产精品av,日产乱码一二三区别免费必看,欧美亚洲自偷自拍 在线

The Acoustic Concrete Tester (ACT) is a    concrete thickness gauge that measures the concrete thickness of pavements,    slabs, retaining walls, foundation footings and tunnel linings. This    nondestructive testing instrument also identifies flaws such as delaminations,    voids, and spalls.

The ACT is precise, light, battery    operated and rugged for field use in all weather conditions. It works for    concrete structures from 75 to 900 mm thick.

The ACT uses Ultrasonic Echo Technology.    It electronically generates a broadband pulse that includes all frequencies    required to accurately determine the thickness of the structure.

The ACT eliminates coring or excavation,    and easily self calibrates the concrete wave speed prior to the test. It    only takes seconds to measure the thickness of the concrete

Measuring thickness with the ACT consists of placing two small probes on    the structure to be tested and touching the ACT screen. A telescoping pole    helps test hard to reach structures. As the structure responds to its    natural frequency, its thickness is displayed on the high visibility ACT    screen. The ACT also calculates the wave speed of structures of unknown    thickness.