1. HBZ series electrical torque wrench tester, is an instrument which is both electrically loaded and manually loaded. When it is electrically loaded to the specified torque test value, it can be slowly, manually loaded to the test value with a hand wheel. This product is beautiful and durable, loaded in both the forward and reverse directions, its double-sensor design can satisfy the testing requirements of various wrenches. 2. These instruments equip with RS 232 interface as their standard configuration, which is used to upload the test data onto the computer, and conduct the statistic analysis of data.