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E. If the device is showing the error "E" on the message screen, check to make sure that you are not moving while calculating the weight. ... If after this the error message hasn't gone away, there may be bad connection on your scale.
Are these a vintage or a digital scales? Is this for general cooking and baking or is it for accurate measuring?
General cooking doesn't need serious accuracy so unless it is seriously inaccurate I wouldn't worry too much about it.
Digital scales can be difficult to accurately calibrate without specialist equipment. For accurate measuring there are companies out there that can calibrate scales to an industrial standard for a fee.
You can check the accuracy of any scale buy using something you know the EXACT weight of. (Bag of sugar or flour). Set up the scales as normal. Add the known weight and read the scale. If it is more than a gram or two out it needs calibrating. On digital scales you might need to press the 'TARE' button before you start to Zero the display.
Most old 'mechanical' scales use a spring as the resistance to the weight you put onto the scale. You can get some adjustment but as the spring gets old it weakens and gets less accurate. Somewhere on the scale there will be an adjuster wheel. Often positioned high up on the back of the scales. *Note* mechanical scales are often not very exact so there will always be some level of inaccuracy.
Set the scales up as you would normally use them. Look at where the needle sits near the '0' mark. Turn the adjuster wheel a few turns, (counting them), in one direction. Press the weight 'Plunger' all the way down two or three times. Check where the needle has moved to. If it has moved the 'wrong' direction wind the adjuster wheel back the number of turns you counted, (the start position), then continue in that direction the same number of turns. Press the plunger down like you did the first time.
This method will show you which way to turn the adjuster and how far to get it back to where the '0' mark is.
Maybe you don't need to check your weight. I don't know you, but if you are happy with yourself, Throw out the scales. Then you won't have to listen to the noise.
Probably there's a build-up of skin oil from your feet that is preventing it from reading properly. Clean off the top of the scale with a cloth dampened in soapy water, then rinse wipe it with a cloth dampened in plain water, and dry it. Be careful not to dribble liquid into the scale.
Note: fat measurement by this method is difficult to do accurately and consistently, For best results, make sure you're properly hydrated at least ten minutes before measuring, and wash and dry the soles of your feet first.
I don't know specifically for this model, but for most like this, 300 or 330lbs is typical. To test a working scale for its max capacity, let a heavier friend try it or carefully hold a weight in each hand and stand very still when its a digital scale. A gallon plastic milk container weighs about 9lbs, so one in each hand,even if filled with water will give you an extra 18 lbs of testing room. You can also let the heavier friend or other person hold the weights to help you test the upper limits.
After stepping on the scale to Activate your number (1-4), hold it down and it will say "reset" or (something to that effect), then Yes, or tap it once and it will say "no". If you want to reset, when it says "Yes", continue to hold it down, and it will then reset to zero.
The scale must be on a hard, level surface. Make sure there is absolutely no dirt on any of the pivot points. Calibrate it with a KNOWN 25 pound weight.
You do not reset the scale. It only saves the last recorded weight of the user. So, if you weighed yesterday, it will put your recorded weight in memory. The next time you select your user number and step on the scale, it will compute the difference from your previous record and save your current weight.
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