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.

ASTM D4057 Weight Multi-Levels Self-Sealing Sampling Beaker, Representative/Upper/Middle/Lower Sample Collecting Container,Brass Material No-Spark, No Welding, No Oil Leakage. Laboratory Petroleum Oil Sample Cans in Tank

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

No-Leakage Cork Brass Weighted Sampling Thief, Comforming to ASTM D4057, ISO 3170 , Laboratory 304 Stainless Steel Oil Sample Collection Catchers in Tanker

Perspex Lower Point Inlet Water Sampler, Acrylic Lake, River, Ocean Water Sampling Beaker, Transparent Water All-levels Sample Cans