A Zone Sampler, also know as a core sampler or a core-type sampling thief, it is designed and constructed such that, when lowered slowly, it is capable of trapping a vertical column of liquid at any selected level below the surface to within 2.0 to 2.5cm of the bottom of the tank. Open at both ends t oallow free flow of liquid through the sampler during lowering.

Viscous Coking Oil Representative Sampling Cans, Brass No-Spark Liquid Petroleum Products Manual Sampler in Tanker

All-Levels Sample Oil Sampler Catchers for Liquid Petroleum Products Tank According to ASTM D4057, ISO 3170

Crude and Fuel Oil Sampling Thief, Bottom Weighted Heavy Oil Sampler, High Viscosity Representative Sample Container, Fixed-Point Sampling Beaker