I assume that if you wanted to precisely measure out the amount of Hyper Wash for the desired dilution ratio of the amount of water you are expecting to use, you could use a plastic medical measuring cup graduated in both ounces or teaspoons/tablespoon and milliliters (cubic centimeters) you find at drug stores or veterinary supply stores for dispensing liquid medicines.
For example, if you are using 2-1/2 gallons (320 fluid ounces) of water to wash with and want a 300:1 dilution ratio, you would need 1.06 ounces of Hyper Wash. If you wanted a little more "robust` dilution ration of say, 250:1, then you need 1.27 ounces of Hyper Wash. If you are accustomed to using the metric system, 2-1/2 gallons is approximately 9.5 liters of water, for a 300:1 dilution ratio, then you need 3.16 millititers. Remember that in computing product needed for the desired dilution rations to sum (add) the dilution ration (water amount PLUS product amount) and divide that into amount of water you will be using.
I am with Britsdaddy on this though on dispensing Hyper Wash; I "eyeball" it and add water to the bucket as needed. One thing about Hyper Wash it that it does,indeed, make a lot of suds/foam when you add pressurized water from a hose with a nozzle that it may be hard to determine how much water you have actually added to the bucket. One way to "mitigate" this is to place the hose nozzle at the bottom of the bucket and use a partially open hose bib/faucet along with a fanned spray pattern with the nozzle OR just use the hose WITHOUT the nozzle (common sense, Captain Obvious!), although the mixing action is mitigated as well, which is why I like leaving the nozzle on.