I have been a scientist for many years, I have had an Ohaus balance since 1998, my lab bought a second Ohaus balance to take to ESA/NASA did a test run of the experiment and ordered it. It arrived in an unbalanced and unbalanced condition. NO quality control and cheap materials. The center balance dial indicator was wobbly and its screw was not properly tightened. I do not recommend purchasing this scale until factory quality control is corrected, Ohouse, you need to change suppliers.