Thinner scale MS-8 shows incorrect weight, shows 10 pounds lighter.

Taylor digital scale, Model # 5721F
Taylor electronic scales are designed to measure your personal weight, as well as your body fat and water weight. Your scale will measure in either pounds or kilograms, indicating your weight to the nearest ounce or gram. You can use the scale as a weight only device or you can take advantage of its bells and whistles by completing the programming process. The scale will store data for up to 10 users. Setup takes only a few minutes.
Set the scale to your choice of kilograms or pounds. The default measurement for the scale is pounds/inches. To change this setting, change the switch on the underside of the scale to kilograms.

hi Sharon.
this link might help you out but not sure.
Thinner scale just keeps flashing 50 0 KG Google Search

The scale probably needs to be calibrated. There should be instructions in the manual.

simply just screw plastic leg on or just put newspaper under it

It's explained in the official user-manual you can download here: www.conairscales.com/catalog.php?product_id=428&ib=en

If this is showing your weight, how do you know how much you actually weigh?
Also, you should be testing on a flat, SOLID surface (bathroom tile works well).

I have a 10 year old Thinner bathroom scales also. Apparently the manufacturer designed it to make battery replacement hard so you'd buy a new scales. To replace the battery, if your unit is similar to mine, turn it over, remove all the screws and separate the top and bottom. You'll see the glass window that shows the weight. It is held in place by four tabs that are slightly twisted. Straighten them, lift the glass assembly clear without straining the wires, and turn it over to reveal the round black battery case. It is secured by three small screws and clear epoxy. Remove the epoxy with a knife blade, remove the screws, and separate the two halves of the case on one side being careful not to separate the other side where there is a metal connection piece. Using the knife tip, remove the CR2032 battery and replace it with a new one (available at Radio Shack or similar stores). Reassemble in reverse order; no need to replace epoxy. My scales worked fine after that.

Your scale is showing you your weight in kilograms what you need to do is change the settings so it shows you your weight in pounds or stones

Conair TH402 displayes incorrect weight

You have probably set your scale to kilogram and not pounds. There should be a button to set this underneath the scale or even a reset button to reset the scale to its original settings.