Even better, you can accurately measure the last little bit of product you can't get with a flow meter. For example, if the near empty tote weighs 365# on the scale and you suck it dry and it weighs 335#. You can rinse the tote right there on the scale, adding as much water as necessary, as many times as necessary. Now suck all the rinse water out into your sprayer and the tote now weighs 322#. You have accurately measured the last little bit of chemical, and you have a clean tote. Try that with a flow meter!