AT Command Tester
Download AT Command Tester for 32-bit Java VM
Download AT Command Tester for 64-bit Java VM

How to check if you have 32-bit or 64-bit Java VM on your machine?
In Windows Command Prompt, type java -version
In above case, 32-bit Java VM is installed in the system. If 64-bit Java VM is installed, you'd see 'Java HotSpot(TM) 64-Bit Server VM' for the version command.
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