The multitester, also known as the multimeter, seems to have been invented by Donald Macadie, a British Post Office engineer.
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an inventor is a designer but a designer is not an inventor
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The possessive form of the noun inventor is inventor's.Example: The inventor's patent was finally granted.
Refrigerator car inventor
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=12&f=G&l=50&co1=AND&d=PTXT&s1=multitester&OS=multitester&RS=multitester
They are easier to read.
The black probe is negative.
the multitester and its parts
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by using multitester
Turn the dial to the omega symbol.
By using a Multitester.
Donald Macadie, post-office engineer, invented the first multimeter in the 1920's. The original multimeter could measure volts, amperes and ohms.
Go to highest scale on AC range
who is the inventor
The plus/minus (red/black) terminals are for testing Direct Current (DC) power sources.