These test instruments are designed in such a way that there is no risk of unintentional ignition when they are used . 这些测量仪表的构造保证它们在使用时不存在早爆问题。
The circuit tester is a simple test instrument which only shows whether the circuit is intact or whether there is a break . 电路导通器是一种简单的量测仪表,它只能检查电路的通断状况。
Research on reliability test instrument of step motor 步进电机可靠性测试仪的研制
Multi - function electronics power parameter test instrument 多功能电力参数测试仪
An electro - motor rotor dynamic balance - testing instrument 一种电动机转子动平衡测试仪