This machine is used to determine the hardness of asphalt material the design features direct vertical loading with loading weight that rest on thrust bearings therefore load is applied to the specimen without transmitting shock to the loading column. At the end of the loading period the depth of penetration of the pin can be read form the dial gauge to an accuracy of 0.01 mm. The thermostatically controlled heater unit has a built in impeller which circulates the water to maintain an even temperature throughout.
Ref. Standard BS 5284 & IS 1195