[Elecraft] K2 parts Un-identified object

[wsm at amaonline.com]

Help!

In my sealed package of parts for the RF probe there is a component
that doesn't appear to be part of the probe, but I could be mistaken.
It appears to be yellow and is on leads like a small resistor.
The print on it is so small that I have trouble reading it even with
a powerful, lighted magnafying glass. It appears to have 10J with
A1 just under that and is 1/8 inch long, and 3/32 inch diameter.
The other components in the package were the .01uf c1, 4.7 Mohm R1,
1n34A diode, along with a couple wire end connectors and a couple
of banana plugs. Anyone know what it is and if it is part of the RF
probe?  And how do they make print that small????

Thanks
Scott N5SM