How do I test the water temperature before running the dishwasher?

Use a candy or meat thermometer to check your water temperature. Turn on the hot water faucet nearest the dishwasher, place the thermometer in a glass, and let the water run continuously until the temperature stops rising. If the water temperature is below 120°F, adjust your water heater. (Page 6)

From the official GE GSD1120 Dishwasher manual, page 6

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