Electric hoist test platform, sound-levelmeter, varnish film thickness gauge, altazimuth, level;
电动葫芦试验台、声级计、漆膜测厚仪、经纬仪、水准仪；
2
Sound-levelmeter by its simple, convenient, the cost is low, the precision higher a series of merits, become one of aircraft noise measurement aspect main metering equipment.
声级计以其简单，方便，成本低，精度高等一系列优点，成为航空器噪音测量方面主要的测量仪器之一。
3
The study was undertaken using a soundlevelmeter operated by a passenger in each car tested.