When you just want to do a simple WCF service test, you don't need to download third party tools. You can use the WCF Test Client app that usually comes as part of a Visual Studio installation. I keep forgetting where to find it, so I'm writing it down on here to remind myself.
I had Visual Studio 2017 installed on my PC. Here is where I found the WCF Test Client app (WcfTestClient.exe):
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C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE