Electronic weighing scale

devagral

Disciple
I have a 40 kg. Capacity electronic weighing machine. When switched on, it displays four zeros, as is normal, bur after a moment the display starts fluctuating, with a minus sign and is never steady. when I press ‘Tare zero’ button, it shows zeros in the display for a moment and starts fluctuating.If weight is put on the weighing platform it shows about 65% of the actual weight and that too fluctuating in a range of about 55% to 65%.Please advise remedial steps, if possible Thanks.
 
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