An increment borer is a precision instrument specially designed to extract a thin cylinder of wood from a tree, shrub, log or pole. It is available in a variety of sizes ranging in length from 4 inches to 40 inches. Although the increment borer is essentially a very simple instrument, it is relatively expensive. Proper operation and maintenance can prolong the life of the increment borer and minimize problems. This manual provides tips on increment borer selection, operation, and maintenance to minimize problems in the field and maximize the utility of the borer. Experience in a specific field application is needed to develop the best and most efficient technique.