Hoto Instruments (Northbrook, Ill.) has developed a hand-held, heavy-duty durometer designed to provide highly accurate hardness measurements. Reportedly easy-to-use, the instrument features non-destructive measurement and optional peak indicators with high repeatability. The company offers four different types: type A uses a flat point to measure conventional rubber; type D has a cone point to measure hard rubber and plastics; type Asker C uses a hemispherical indentor to measure soft rubber and foam; and type Asker F has a flat indentor to measure sponge as well as urethane and polystyrene foam.