I prefer to buy Made In U.S.A. products when I can and was surprised to find out that Probe Master makes their probes right here in America. While you can find multimeters still made in the U.S.A. (Fluke), the test probes are typically made in China.
Mavromatic demonstrates the PentaRef by VoltageStandard.com using an Agilent 34461A 6.5 Digit Multimeter. The PentaRef is a great tool to test the accuracy of your digital multimeter (DMM) easily.