The images below are of our latest machined copper block for a customer’s stirred water calibration bath. It is 250 mm long by 80 mm in diameter. The probe holes are 10 mm in diameter and drilled to an impressive depth of 200 mm. Drain holes 3 mm in diameter are through drilled into the probe holes to make life easier when the block is removed from the bath and needs draining. See below for an image of the top of the block and one of the base.