The SampleSizer® is for use with Taylor’s #9198 sample tube or the 2000 Series™ comparators. Using this tool, you won’t need to flick off excess water to get the meniscus to rest precisely on the fill line. Simply lower a SampleSizer into the water to be tested. It will displace exactly the right amount to leave the correct volume to perform the test: either 25 mL or 10 mL, depending on which end of #6190 goes in first.