Product Description ​ The Sponge Hardness Tester applicable to measure hardness of soft foam material and polyurethane foam rubber products. The tester different from other hardness testers in measuring. When measuring, the presser foot contact measured sample directly. Product Parameters Accuracy ≤±1HF Resolution 0.1HF Range 0~100HF Spring force 455gf Sensor Head Diameter 25mm Sensor Foot Diameter 80mm Case High impact ABS Operating temperature 0~40°C Size 176x80x80 mm Power Supply 2x1.5vAAA Um-4 Battery Weight 310 g (Not including batteries)