1 Bar High Flow Ceramic. Used to calibrate all types of electrical moisture measuring blocks. Also suitable for soil moisture extraction work with vacuum systems. The Cup Extractors are 3-1/4" (8.3 cm) overall height by 2-1/2" (6.4 cm) outside diameter and will fit into the 1500F2 and 1600F1 Extractors. Inside cup dimensions are 1-3/4" (4.5 cm), diameter by 2" (5.1 cm) deep.