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<p>[QUOTE=&quot;desertgem, post: 4548261, member: 15199&quot;]Lev99 if it is an electronic scale recently , check the battery date if included, otherwise use a good quality battery and follow the manufacturer instructions for calibrating. If it is china manufactured ( and most inexpensive ones are ), most are re-labeled with difference names for tracing sales, etc. with only about 2 major companies making most of them. The Chinese scientific lab balances are well designed and accurate and come with a set of calibration weights, but also cost $$$$ up. Most college and research uses such as they are faster and need less maintenance and skill than the older balances such as Mettler and Ohaus. </p><p><br /></p><p>Also if the need to find specific gravity of a coin to determine variations in say % of gold/copper , a scale can do this with a &quot;kit&quot; that sets over the scale. I use this for my gems and rough to validate its characteristics.</p><p><a href="https://www.mineralab.com/SpecificGravity/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.mineralab.com/SpecificGravity/" rel="nofollow">https://www.mineralab.com/SpecificGravity/</a></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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