MODTECH V2 refillable research pen in blue, capped, with the dial window at the base
MODTECH V2 refillable research pen in silver, capped, with the dial window at the base
What's included with the silver V2 pen: cap, body with 60-click dial, cartridge holder and screw rod. No cartridge included
Close-up of the silver V2 dial: clear window, 60 click stops, 0.01 mL per click
Why a pen: load once, dial after that. 60 click stops at 0.01 mL, a 3 mL cartridge is five dial turns, 6.3 in and stores loaded. Silver V2
How to load the V2 pen. Where's the holder? It arrives fitted under the cap: pull the cap straight off, unscrew the clear holder, slide in a 3 mL cartridge metal cap first, screw the holder back on, then the cap. Silver shown
Silver V2 pen: outer cap separates the enclosed cartridge from direct cold-pack contact. Pen only; cold pack and travel case not included.
What's included with the blue V2 pen: cap, body with 60-click dial, cartridge holder and screw rod. No cartridge included
Close-up of the blue V2 dial: clear window, 60 click stops, 0.01 mL per click
Why a pen: load once, dial after that. 60 click stops at 0.01 mL, a 3 mL cartridge is five dial turns, 6.3 in and stores loaded. Blue V2
How to load the V2 pen. Where's the holder? It arrives fitted under the cap: pull the cap straight off, unscrew the clear holder, slide in a 3 mL cartridge metal cap first, screw the holder back on, then the cap. Blue shown
Blue V2 pen: outer cap separates the enclosed cartridge from direct cold-pack contact. Pen only; cold pack and travel case not included.
MODTECH V2 refillable research pen in green, capped, with the dial window at the base
What's included with the green V2 pen: cap, body with 60-click dial, cartridge holder and screw rod. No cartridge included
Close-up of the green V2 dial: clear window, 60 click stops, 0.01 mL per click
Why a pen: load once, dial after that. 60 click stops at 0.01 mL, a 3 mL cartridge is five dial turns, 6.3 in and stores loaded. Green V2
How to load the V2 pen. Where's the holder? It arrives fitted under the cap: pull the cap straight off, unscrew the clear holder, slide in a 3 mL cartridge metal cap first, screw the holder back on, then the cap. Green shown
Green V2 pen: outer cap separates the enclosed cartridge from direct cold-pack contact. Pen only; cold pack and travel case not included.
MODTECH V2 refillable research pen in pink, capped, with the dial window at the base
What's included with the pink V2 pen: cap, body with 60-click dial, cartridge holder and screw rod. No cartridge included
Close-up of the pink V2 dial: clear window, 60 click stops, 0.01 mL per click
Why a pen: load once, dial after that. 60 click stops at 0.01 mL, a 3 mL cartridge is five dial turns, 6.3 in and stores loaded. Pink V2
How to load the V2 pen. Where's the holder? It arrives fitted under the cap: pull the cap straight off, unscrew the clear holder, slide in a 3 mL cartridge metal cap first, screw the holder back on, then the cap. Pink shown
Pink V2 pen: outer cap separates the enclosed cartridge from direct cold-pack contact. Pen only; cold pack and travel case not included.
MODTECH V2 refillable research pen in orange, capped, with the dial window at the base
What's included with the orange V2 pen: cap, body with 60-click dial, cartridge holder and screw rod. No cartridge included
Close-up of the orange V2 dial: clear window, 60 click stops, 0.01 mL per click
How to load the V2 pen. Where's the holder? It arrives fitted under the cap: pull the cap straight off, unscrew the clear holder, slide in a 3 mL cartridge metal cap first, screw the holder back on, then the cap. Orange shown
Orange V2 pen: outer cap separates the enclosed cartridge from direct cold-pack contact. Pen only; cold pack and travel case not included.
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.

MODTECH · Machined aluminum · 0.01 mL per click

V2 Research Pen

Sale price$29.99Regular price $32.99

1 reusable pen. Cartridges sold separately. No substances included.

No printed manual in the box. Setup is a 2-minute guide, online and kept current. Read the guide →

Color
Color: Blue

Choose pen or kit

Kit choices keep your selected pen color.
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 in the color you choose. The cartridge holder ships already inside the pen.
Not in the box
Cartridges, 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

Load It Once. Dial It After That.

A refillable research pen calibrated at 0.01 mL per click, fill a 3mL glass cartridge once, and every session after is dial, dispense, done.

0.01 mL per click. Sixty click stops on the dial, each a fixed step you feel rather than read.
Standard 3mL cartridges, drop-in. Same cartridge as the V3 — no adapters, nothing proprietary.
Machined aluminum, not a disposable. Solid body, firm mechanical click, protective cap. Built to be refilled.
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.
  • 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.

Why a pen

01

Load it once. Dial it after that.

You fill a sterile 3mL glass cartridge one time and drop it in. Every session after that is three moves: dial, dispense, done. No drawing up a fresh syringe, no holding a barrel up to the light hunting for a graduation mark.

The filling step happens once per cartridge instead of once per session. That's the whole reason the pen exists.

02

0.01 mL per click. You feel it, you don't read it.

The dial has 60 click stops, and each one is a mechanical detent. A fixed step in the hardware, not a mark you interpret. That's why the same dial position gives you the same amount on your fiftieth session as on your first.

Repeatability comes from the mechanism, not from your eyesight or the lighting. The dial stops at 60, so 0.6 mL is the most in one turn.

03

Machined aluminum. Built to outlast the cartridges.

Solid body, firm mechanical click, protective cap, a reusable instrument, not a disposable. It's 6.3 inches and 1.76 oz, slim enough to live in the fridge door with a cartridge already loaded.

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.

Reviews

Most of these reviews come from our Amazon listing.

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.

Does the pen come with a cartridge?

No, the pen and the cartridges are separate purchases, and you'll need at least one cartridge before the pen does anything. We sell them in 10 and 20 packs, steam sterilized and individually sealed.

If this is your first pen, take the 10. After a month you'll have a much better idea what you actually go through, and the 20-pack will still be here.

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.