EnerGel RTX Retractable Liquid Gel Pen

The Verdict

Is the Pentel EnerGel RTX actually the “best gel pen under $10” that office-supply forums keep crowing about? After 240 Amazon ratings averaging 4.8 stars, the numbers say yes. But numbers don’t tell you how it feels when you’re signing a contract or scribbling margin notes for three hours straight. I’ve tested this pen against the Uni-ball Signo and Pilot G2 — here’s the honest breakdown.

What You Actually Get

The EnerGel RTX is a retractable liquid gel pen available in 0.5mm and 0.7mm tip sizes. The barrel is lightweight plastic with a textured rubber grip that doesn’t collect lint (a small miracle). The metal clip is genuinely functional — it slides over notebook covers and shirt pockets without snapping. Refills are sold separately (Pentel’s LR7/LRN5 series), so the pen body is built to last.

The Ink: Where It Wins or Loses

This is a liquid gel ink, not the thicker paste you find in a Pilot G2. That distinction matters. The RTX lays down a wetter line that dries in about 1-2 seconds — I timed it on standard copy paper. Left-handed writers consistently praise this in reviews; one buyer noted, “I’m a lefty and this is the first pen that doesn’t smear all over my hand.” The tradeoff? You’ll burn through refills faster than a ballpoint. If you write more than 10 pages a week, budget for replacement ink.

The 0.7mm tip delivers that classic gel-pen glide — smooth, dark, consistent. The 0.5mm is noticeably finer and more precise for small handwriting, but it can catch on rough paper fibers. If you use cheap notebook paper, stick with the 0.7mm.

What Buyers Keep Praising (and One Real Complaint)

Scanning through the 240 ratings, three themes dominate:

1. Smoothness — “Writes like butter, no skipping even on glossy receipts.”
2. Smudge resistance — “Dries fast enough that I don’t smear my notes when I flip pages.”
3. Comfort — “The grip is soft but not squishy. My hand doesn’t cramp after a full day of writing.”

The most common criticism? Ink longevity. As one 4-star reviewer put it: “Great pen, but I go through one refill every two weeks. Wish it lasted longer.” That’s physics — liquid gel ink is wetter, so it depletes faster. It’s not a flaw in manufacturing; it’s the nature of the formula.

Who Should Buy This

• Students and note-takers who need fast-drying ink to avoid smudged notebooks.
• Left-handed writers — this is genuinely one of the best options under $10.
• Professionals who sign documents — the 0.7mm tip produces a clean, authoritative signature.

Skip it if you want a pen that lasts months without a refill (get a ballpoint instead) or if you prefer an ultra-fine 0.38mm line (this pen tops out at 0.5mm).

FAQ: What Shoppers Actually Ask

Q: Does the EnerGel RTX smudge on highlighters?
A: Yes, if you highlight immediately after writing. Wait 10-15 seconds for the ink to fully set. Gel ink is water-based, so it reactivates with moisture.

Q: Can I use it for exam writing?
A: Absolutely — most standardized tests accept gel pens. The fast-dry ink reduces smearing risk during timed essays.

Q: How does it compare to the Pilot G2?
A: The RTX dries faster and feels smoother. The G2 has a slightly more “scratchy” feedback and slower dry time. The RTX also has a better grip for long sessions.

The Verdict

Buy it if you want a smooth, quick-drying gel pen that won’t smear your work or cramp your hand. It’s an excellent daily driver for office, school, or home.

Skip it if you’re on a strict budget for consumables (refills add up) or need an ultra-fine tip for tiny handwriting.

Rating: 4.6/5 — The ink consumption is the only real deduction. Everything else — comfort, reliability, smudge resistance — delivers exactly what the 4.8-star average promises. For a pen at this price point, that’s a rare bargain.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.