John Deere, as a global manufacturer, uses both the metric and standard measurement systems in their products, depending on the market they are catering to. In general, the company's products sold in the United States and Canada use the standard measurement system, while the products sold in other countries, such as Europe, tend to use the metric system. For example, John Deere tractors and other heavy equipment sold in the United States use inches, feet, and gallons as the standard measurements. On the other hand, tractors and other equipment sold in Europe and other metric countries use centimeters, meters, and liters as the standard measurements. Additionally, as per the industry standards, John Deere products are manufactured following the SAE (Society of Automotive Engineers) and ISO (International Organization for Standardization) standards. It's worth noting that this is a general information and it might vary based on the specific product and market.