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GPINTCheck and GPUSBCheck are simple, free software applications that you can use to verify that your GPINT-PT or GPUSB, computer, and scope mount are all working together properly. You can download them using the links found below. You should use this the first time you set up your system. You can also use it as a debugging tool anytime your system is not functioning properly. If your system works fine with GPINTCheck or GPUSBCheck, but not with your third-party software, then the problem most likely lies with the third-party software and you should contact them for technical support. If your system does not work with GPINTCheck or GPUSBCheck, then you should contact us for technical support.