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Member 4 year s ago
#3 is a reamer - when a hole is drilled into metal and you want the hole larger, you would ream this bit in and out to enlarge it.
       
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Carwash 4 year s ago
Member no it isn't. It is a screw extractor for broken screws or bolts. Note the threads turn left handed in order to get a tighter grip in an anti clockwise direction
after drilling a hole inside the screw. A reamer has sharp ridges and are set in a clockwise direction
       
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It has strong magnets inside, the electrode sits between them

Answer: It is a Cold Cathode Vacuum Gauge. We use them in Vacuum Braze Furnaces to measure the vacuum in the furnace when it is below 1 micron and moves into the Torr Scale at 3.0 x10-3 and lower.

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