This unit is used for recording flow (diameter change) before failure.
A special dial indicator with a maximum position brake mechanism
A guide sleeve that fits over either guide rod on the 4" and 6" Marshall Breaking Heads
This product is also available in metric graduations.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.