Green V2 pen with two empty 3 mL glass cartridges, a sterilization pouch label, and one cartridge sealed in its pouch
Fridge fit guide: allow 6.5 inches of clear shelf width or depth along the pen. V2 length is 6.3 inches; leave room for the door to close.
3 mL cartridge measurements: 11 mm stopper length, 11.60 ± 0.15 mm barrel outside diameter, 62.30 ± 0.20 mm glass height, lip to base. 3 mL borosilicate glass. Fits V1-style, V2 and V3 pens. Photo not to scale.

MODTECH · One V2 pen and two 3mL cartridges

V2 Research Pen with 3mL Cartridges (2 Pack)

$32.99

One V2 pen and two 3mL cartridges.

Color
Color: Green
In stock, ready to ship
  • Free U.S. shipping. Ships in 1–2 business days, then 3–5 business days in transit.
  • 7-day money-back guarantee (30 days with Buy with Prime). Details
  • Questions? Email tfortech@modtechsupply.net. We reply within one business day.

Taxes calculated at checkout.

In the box
One V2 pen with the cartridge holder already inside, and 2 empty sterile 3mL cartridges, each sealed in its own pouch.
Not in the box
Needles and printed instructions. The manual lives in the Help Center, so it stays current.
Fits
Any 3mL glass cartridge with an 11mm long stopper. What fits
Ships
Empty. No substance is included with or sold alongside any product.
Before your first use

Read the hardware setup guide before loading a cartridge. Check the parts, follow the loading guide, and use troubleshooting if the mechanism feels unfamiliar.

Read the setup guide · Get help with your pen
One pen, two sterile cartridges. Steam sterilized and sealed one per pouch.
0.01 mL per click. A fixed step you feel rather than read.
Enough to get started. Refill from any 10 or 20 pack when they run out.
How To Use

Find setup guides, troubleshooting, and answers to common questions in our Help Center.

Free Shipping In The US

Free shipping on U.S. orders only. Processing takes 1–2 business days. Estimated delivery is 3–5 business days after processing. Tracking is emailed when your order ships.

Disclaimer

MODTECH products are precision hardware sold for laboratory and research use only. They are not medical devices. No substances are included with or sold alongside any product, and nothing on this page constitutes medical advice or instructions for administering any substance to humans or animals.

Pairs well with
  • 4.5 across all MODTECH products · 55 reviews Most come from our Amazon listing.
  • Free U.S. shipping Ships in 1–2 business days.
  • 7-day money-back guarantee 30 days with Buy with Prime.
  • Direct line to the owner A reply within one business day.
  • Veteran-owned Seguin, Texas.

How it’s built

The plunger rides on a corkscrew thread.

That’s what turns one click into a fixed amount of travel. The V2 and V3 share the same mechanism, so switching models changes the look, not the numbers.

per click
0.01 mL
clicks to a turn
60
glass cartridge
3 mL
long stopper
11 mm
V2 pen with the cartridge holder removed, showing the screw rod, dispense window and dial

Screw rod.
A fixed amount of travel per click.

Machined aluminum.
Not molded plastic.

Dispense window.
You read a number, not a mark.

Increment dial.
60 clicks, 0.01 mL each.

Questions people ask before buying

Didn’t find your answer? Email tfortech@modtechsupply.net. We reply within one business day.

Find more answers in our Help Center.

What is included?

This kit includes one pen and the cartridge quantity shown in the product title. Pens and cartridges ship empty.

V2 or V3 — which one do I buy?

Whichever one you like the look of. They're mechanically identical: same 60-click dial, same 0.01 mL per click, same cartridge.

The V2 is the cheaper of the two. There is no "more accurate" model, so you're not trading away precision either way.

Do I have to refill it before every session?

No, and that's the whole point of the pen. You fill a cartridge once, drop it in, and every session after that is dial, dispense, done. The filling step happens once per cartridge instead of once per session.

New pen feels stiff. Is it faulty?

Almost certainly not. That's the mechanism bedding in, not a fault, and a brand-new pen tested this way looks broken when it isn't. Resistance is the sum of several things and they stack — a fine tip on a cold, slightly viscous solution feels far worse than either problem alone.

Do you sell pen tips?

No, we do have recommendations over at the Pen Tips page.

The pens take standard universal screw-on pen needles, available anywhere they're sold. Fresh tip every session.

Does it come pre-filled?

No. Pens and cartridges ship empty. It dispenses whatever you put into the cartridge, at the amount you dial, and it has no opinion about what that is.

How fast does it ship?

Free shipping on U.S. orders only. Processing takes 1–2 business days. Estimated delivery is 3–5 business days after processing. Tracking is emailed when your order ships.