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The Pelikan M205 Classic Highlighter Duo Pen Sets, translucent yellow barrel (975524) has been around since about 2014. It also comes in a green colour barrel. This is a set which comes with the piston filled fountain pen (that is, there is no cartridge as the ink is stored in the barrel of the pen) and "special" yellow highlighting ink. Note: don't use this ink in other fountain pens as it may affect the materials. The ink is very bright and certainly does the job to highlight text, moreso for underlining rather than covering the whole text (as it produces a line about 1mm wide)
The pen comes with a BB (double broad, creates approx 1mm wide line) steel nib and can also be used with normal fountain pen ink. The nib is threaded so it can be changed for a different size, but can also be easily removed for cleaning.
Peters of Kensington has the same pen on special for $157 + 5.50 =$162.50
Description
And now, Pelikan is turning the concept of the humble fountain pen on its head, by combining it with the ever-reliable highlighter with their M205 Highlighter Yellow Fountain Pen and Ink Bottle. With a barrel made from transparent plastic, and polished stainless extra broad nib and trim, this contemporary writing instrument includes a bottle of specialised M205 highlighter ink so you can make corrections on important documents and even your first novel draft.
With the M205 Highlighter Yellow Fountain Pen and Ink Bottle, the tradition meets modern, which is perfect for the organised business person of the 21st Century.The fountain pen even comes equipped with a clever differential piston plunger filling system for your convenience, so your writing flow will never have to stop - for long, anyway.
Filling the Pen
1) Un-cap the pen and rotate the piston knob at the end of the barrel fully counter-clockwise (the piston should be all the way down towards the nib);
2) immerse the nib completely in the ink;
3) rotate the piston knob fully clockwise, drawing ink into the reservoir;
4) now, expel the ink back into the bottle by rotating the piston knob counter-clockwise again (it is often necessary to fill & empty the pen a couple of times to be certain one fills it to capacity);
5) Fill the reservoir again by performing steps 2 and 3 again;
6) With a filled reservoir and with the nib over the ink bottle, expel 4 to 6 drops of ink back into the bottle;
7) Point the nib up and rotate the piston knob fully clockwise;
8) With a soft tissue, gently wipe off any ink that may be on the barrel end;
9) Next, hold the tissue to the back of the nib (on the black plastic feed) for about 3 seconds—to draw off any extra ink in the feed. This clears the feed's air channels;
10) Lastly, gently wipe off any ink on the top of the nib. That's it!
or just use this for under $1…