Scott Lurndal wrote, on Tue, 23 Dec 2014 21:28:09 +0000:

http://www.bitscope.com/product/BS05/

Thanks Scott,

I have a call to a scientist friend, who might have the capability
to measure 1 to 5 microamperes of current.

A funny thing is that one of the service personnel told me to
measure "5 ohms" (I swear I heard him right) of the flame sensor.

When I questioned him, he said he always measured if it was 5 ohms.
When I asked him *how* he measured it, he *clearly* explained that
he hooked one lead to the disconnected wire and the other lead to
the spade on the flame sensor while the flames were heating it up.

He kept telling me that was ohms, and I told him two or three times
that he can't possibly be measuring ohms that way, but he insisted
he tested the ohms that way all the time, and determined whether a
flame sensor was bad that way.

Sometimes these technicians scare me.