Bottom Weighted Oil Sampler

This bottom weighted sampler confirms to ASTM D4057. 
It has a weighted unit(1kg) installed at the sampler's bottom so that It can collect sample in viscous oil and sink readily in the liquid to be sampled. It can be used to obtain spot, running, and all-level sample.
The cork can be opened by jerk. To reduce the difficulty with cleaning the beaker, the weighting unit is installed on the sampler by thread, with no contact with the sample.
The bottom weighted unit and the neck is detachable, without welding, easy to clean.