Is there a simple continuity tester available?
Yes. There are different models in the market and their prices vary according to their sophistication. Basically are pen-type devices which can be applied by touching an object, they are connected by a multi stranded cable to a ground point by means of an alligator clip. Some provide multiple usages by just replacing a couple of components, as follow: There is the type which is used to test non powered objects and carry a couple of pen size batteries (AAA), has a small lamp which will light up if the resistance encountered is less or about a specified threshold. Without batteries they can test continuity from live objects in different ranges, depending of the voltage range of the lamp used eg
