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对进气口直径4mm的小型采样夹性能和应用效果进行了测试和评价。结果表明，不同滤料在小型采样夹中产生阻力有所不同，采集样品后滤料阻力都有增加，但变化较小，对流量影响不显著；在产生烟、尘、雾的作业现场进行应用，它能捕捉不同大小的粒子，采样效率较高，与铝合金采样夹相比较，两者之间差异无显著性，测定结果基本一致，小型采样夹可以作为时间加权平均浓度监测的采样工具。
The performance and application effect of small sample holder with inlet diameter of 4mm were tested and evaluated. The results show that the resistance of different filter media in the small sample holder is different, the resistance of the filter media increases after the sample is taken, but the change is small and the influence on the flow rate is insignificant. It is applied in the job site where smoke, dust and fog occur , Which can capture particles of different sizes and has higher sampling efficiency. Compared with the aluminum alloy sample clip, the difference between the two is insignificant and the measurement results are basically the same. The small sample clip can be used as a sampling tool for time-weighted average concentration monitoring.