1. Manual drive 

2. Disc falling frequency: 120 blows / min (allowable error 15%) 

3. Built in hit counter Refer to ASTM d4318 Standard Test Method for liquid limit of soil for the use method of disc type liquid limit meter Technical specifications:（Electric） 

3.1. Voltage: 220V 

3.2. Electric motor drive 

3.3. Disc falling frequency: 120 blows / min (allowable error 15%) 

3.4. Built in hit counter Refer to ASTM d4318 Standard Test Method for liquid limit of soil for the use method of disc type liquid limit meter