About: http://webisa.webdatacommons.org/50196259

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Used refractomers occassionally come available on eBay.Balance Beam Scale and Heavy LiquidsAnother gem lab necessity is a means to measure specific gravity.
http://www.w3.org/ns/prov#wasQuotedFrom	gemsociety.org