It varies depending on the scale. Usually they require an exact mass to calibrate with, such as 500g or 100g.
To calibrate most pocket scales, you typically hold the MODE or UNIT key for several seconds until the display changes to show the internal statement number, or says "CAL". At this point, the display may change to show the required calibration weight, or you may need to tap the MODE or UNIT key once more to set the zero point first. Once the display shows the required calibration weight, you then place that exact weight on the platform and wait for it to say "PASS" automatically, or you press MODE/UNIT key to confirm. Once calibration completes, the scale will either turn off or return to normal operation. Turn the scale back on and place the same calibration weight on the platform and make sure the correct value comes up (± a division or two).
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Having the same problem with my scale. There is in information regarding this which is a great big negative.
Call them to ask for one.
My weight watchers scale has a switch on the back. Just move the switch to the unlocked position.
Place the plate on the scale and then power up the scale. It turn on at Zero.
According to the Weight Watchers Points scale, one serving of Michelob Ultra is 2 points. This beer is 95 calories per serving. Weight Watchers Points help those participating in their weight loss program keep track of how many calories they are consuming per day in order to promote healthier and more mindful eating habits.
A Weight Watches scale can be purchased at many common locations. These locations include Walmart, Amazon, Conair, the Weight Watchers website and Home Depot.