How do I calibrate a Fat Max Studfinder 400 - Stanley Proto Stanley Tools 77720 Stud Sensor 200 Stud Finder

Scales are supposed to show correct weigt. Who told you to "calibrate" it? Your scale is not working correctly. Return it and ask for a good scale

It's important to find the model number to be able to find the correct manual. Below is a link to FAQ's about Taylor body fat scales.
If you do a google search for "taylor body fat scale" you will see a list of a few models. Examine each to see if one of them is the same as yours.
Taylor USA FAQs Scales

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replace the battery and if it still doesn't calibrate then junk it

hi there,
try this for gta 2 sandreas

Health and Stats

$250,000, full health and armor - HESOYAM
Infinite Health (no damage from bullets, melee attacks, and fire) - BAGUVIX
Commit Suicide - GOODBYECRUELWORLD
Hitman Rank and Perks in All Weapons - PROFESSIONALKILLER
Infinite Ammo - FULLCLIP
Infinite Lung Capacity - CVWKXAM
Jump Higher - KANGAROO
Jump Higher on BMX - CJPHONEHOME
Lower Muscle/Fat Stat - KVGYZQK
Max Fat Stat - BTCDBCB
Max Muscle Stat - BUFFMEUP
Max Respect Stat - WORSHIPME
Max *** Appeal Stat - HELLOLADIES
Max Stamina - VKYPQCF
Max Vehicle Stats - NATURALTALENT

here is the link to calibration procedure for your scale.
https://global.dymo.com/enUS/RNW/RNW.html?pg=std_alp.php?p_li=&p_accessibility=0&p_page=1&p_cv=&p_pv=1.690&p_prods=690&p_cats=&p_hidden_prods=&prod_lvl1=690&prod_lvl2=0&p_search_text=&p_new_search=1&p_search_type=answers.search_nl

Press and hold the "+ - units" button and hold for over one second. It should then let you select your units of measure. In this case it should be the second selection, which is "0.00 ft". If you lost your owners manual, you can download one at www.engineersupply.com/Manual-and-Help-Docs/Stanley-TLM100-Manuals.pdf. If you find this helpful, please rank the solution.

how can change lb to kg

This link allows you to trouble shoot directly with the company... I hope this helps. http://www.taylorusa.com/advantage/root/contact.html