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Inhaled hexavalent chromium is recognized as a human carcinogen. Workers in many occupations are exposed to hexavalent chromium. Problematic exposure is known to occur among workers who handle chromate-containing products and those who grind and/ or weld stainless steel. Workers who are exposed to hexavalent chromium are at increased risk of developing lung cancer, asthma, or damage to the nasal epithelia and skin. Within the European Union, the use of hexavalent chromium in electronic equipment is largely prohibited by the Restriction of Hazardous Substances Directive.
Ive seen that on some meters. This is usually because the manufacturer left the reference connection floating (not tied to + or - or ground)If you touch your meters probes together your reading should drop to Zero
You may have the poles on your switch wired backwards. Just flip your labels and you should be fine
Table for Electronic Dreams