测试杆 meaning in English

reference test bar
reference test rod

Test bars are usually cast for each heat , but their analysis may be inconclusive
测试杆通常针对每个温度，但是它们的分析可能是不确定的。
The single unit cap and lifting lever permit manual valve opening ( testing ) with low required force on the lever
这种一体式阀盖和提升杆使得检测人员只需轻轻扳起测试杆即可人工手动开启阀门进行测试。
Even if the round test bar indicates acceptable chemical and physical properties , the casting itself may have undetectable inherent deficiencies that reduce strength or corrosion resistance
即使圆形测试杆表明化学特性和物理特性是可接受的，逐渐本身仍然可能存在难于察觉的有损强度或防腐能力的内部缺陷。