Sometimes when weighing a bottle, you may notice that the amount the WISK app displays doesn’t match the amount remaining in the bottle.

For example, you place a near-full bottle on the scale, and the app says only 0.5 of a bottle remains.

In order to sort out the issue, take the following steps:

  1. Make sure the scale is on a flat and level surface and has been zeroed
  2. Make sure the size of the bottle you’re weighing is the same as the item called up in the app (for example, you may have a 750ml bottle pulled up, but are weighing a 1L bottle)
  3. Verify that the weights on file for the item are correct, and add a new weight if necessary
  4. Check the item category / add an empty weight

For each step, you’ll see a detailed explanation below.

1.Scale

Whenever you’re using the scale, follow these best practices:

  • Place the scale on a flat and level surface
  • Have all four feet of the scale touching the surface
  • Zero the scale (press the tare button if it displays anything other than 0g if nothing is on the scale)

If the scale is not placed properly, it can display an incorrect weight that can be off by a few hundred grams.

Reposition the scale, and try weighing the item again. If it is still incorrect, move to the next step.

2. Scanned the Wrong Bottle

Pay close attention to the volume of the bottle that is called up in the app.

For example, if you have a 1.14L bottle of Jameson called up in the app, and you have placed a 750ml bottle on the scale, you won’t get an accurate measurement because they have different full weights.

This is most likely to occur when using the “List view” while taking inventory since you aren’t scanning the physical item. Always verify the volume of the bottle that displays when entering your counts.

Note: If you’ve scanned the bottle, and the volume that pulls up in the app is different from the physical bottle, you can edit the bottle information. Learn more here:

If the volume in the app matches the physical item, but it is still displaying the wrong amount, move to the next step.

3. Wrong Bottle Weight

For each item, there is a full and empty weight field. For the majority of items, WISK is able to take the full weight, and compare that to the density of the alcohol type (based on category: rum, vodka, etc) to calculate how much remains in the bottle.

If there is an empty weight on file for the item, it ignores the density rating, and calculates what is left based on the full and empty weights.

If either the full or empty weight (if there is one on file) is inaccurate, it won’t display the correct amount remaining in the bottle.

Full Weights

It’s possible the full weight of an item may be incorrect. Bottle weights can change over time due to changes in packaging.

When a bottle is called up in the app, you’ll see a “Full weight” section, which shows the average full weight of the item. You can have more than one full weight on file for an item, since it’s unlikely that all bottles of that item weigh the exact same.

In the image below, it shows the average full weight of a Jameson 750ml bottle is 1280.67g. If you tap “Full weight”, you’ll see all the full weights assigned to the bottle.

If you have a full bottle of the item on hand, place it on the scale and compare it to the full weights on file. If there is a large variance, you can delete the inaccurate weights and add a new one.

To add a new full bottle weight after scanning a bottle:

  1. Tap the full weight that displays beneath the bottle
  2. Swipe the incorrect full weight to the left and tap "Delete"
  3. Tap Add Weight (or the + symbol on the top right)
  4. Enter the empty bottle weight in grams / kg / lbs
  5. Tap “Done”
  6. Tap the back arrow and you'll see the new weight displays

To learn more about adding and removing bottle weights, see here:

With the new full weight on file, weigh the partial bottle again, and see if the output matches the expected result.

Empty Weights

If there is an empty weight on file for the item, it ignores the density rating and calculates what is left based on the full and empty weights.

If the empty weight appears incorrect, you can remove it and add a new one. To learn more about adding and removing bottle weights, see here:

For more information on Empty Weights, see the Item Category / Liquid Density section below.

4. Item Category / Liquid Density

In most cases, WISK uses the full weight of a bottle and the density of the alcohol to calculate how much liquid remains in a bottle.

The density of water (with a specific gravity of 1.0) is used to determine the density of other liquids.

You can see the specific gravity of each category on the WISK Web Portal by going to the Families & Categories section and clicking the details button beside a category.

For some types of alcohol (mainly liqueurs), the specific gravity can vary based on the product. In WISK, the default category of Liqueur and Cream is set to 1.06. However, something such as Cointreau has a specific gravity of 1.04, but Creme de Cassis is around 1.18.

This can lead to some cases where a bottle may be close to empty (1oz remaining) and WISK says there is nothing left in the bottle. For more information, see here:

Typically, alcohol with a lot of sugar is heavier than water (liqueurs, creams), and spirits that contain no sugar (gin, whiskey, etc.) are lighter than water.

To get a more accurate measurement (particularly with items in the “Liqueur and Cream” category), you can add an empty weight to the item.

With a full and empty weight on file, it uses those values to calculate how much remains in the bottle. The density rating for the category as a whole is ignored.

If you have scanned a bottle that is almost empty, you can pour the contents out into another container, and record the empty weight of the bottle to get a more accurate measurement.

To add an empty bottle weight after scanning a bottle:

  1. Tap the Edit Bottle icon
  2. Tap the Empty Weights (g) field
  3. Tap Add Weight
  4. Enter the empty bottle weight in grams, kg, or Lbs
  5. Tap “Done”
  6. Tap the back arrow and then “Save”

After going through all these steps, this should resolve the issue.

If it’s still not displaying the proper amount, please contact support@wisk.ai.

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