Be sure of a solid weld by testing for small holes that can cause leaks. The spark tester will throw an arc to a ground if problem areas are detected..小洞成泄漏測的焊縫牢固確定。火機將拋出一個弧到地如果域的檢測..This unit is small, light weight, and completely self contained..本單位是小完全包含的。#MS602 (110V).# ms602110V。#MS600 (220V)# ms600220V