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Foresters commonly use these prisms to measure the basal area factor (BAF) of trees. They feature a glass construction, which is either clear or amber tinted. Amber prisms provide a brighter image, which can aid in visibility during conditions with little sunlight. Our prisms are available in several different Basal Area Factors (BAF).
In Ontario and Eastern Canada, BAF2 metric prisms are the most common. Please note that other BAF's are available, as a special order.