Model:Rubber Shore D Durometer Hardness Tester Dial Value:0 ~ 100HD Recommended Range:20 ~ 90HD Pressure needle head size:SR 0.1 mm weight:0.5kg Pressure needle stroke:2.5 mm Operation:manual Delivery:3~7days Suitable for:hard rubber, hard resin, acrylic, glass... Advantage:easy reading, accurate, high precision