The best T-blade trimmers for lineups

A T-blade is not a small clipper

This is the thing worth understanding before spending anything. A clipper blade is narrower than the tool, with rounded corners, built to feed a volume of hair into a cutter and take length off evenly. A T-blade is wide and square, and its teeth extend past the housing on both sides.

That overhang is the entire point. It lets you put a corner of the blade exactly where you want a line and drive it along, with nothing on the tool getting in the way of your sight line. A clipper cannot do that, and no amount of motor makes up for the geometry.

What this page ranks on

1. Published motor speed. Unusually for grooming, this category does publish it - three of the four tools here give a real SPM figure, which makes them genuinely comparable.
2. Published blade material. Carbon steel takes a finer edge and rusts; stainless is more forgiving and less sharp; ceramic runs cooler. Only some makers say which ships on the tool.
3. Weight. Lineup work is wrist work at awkward angles. The spread here is7.8 to 17.5 oz, which is more than double, and you feel it.
4. Published warranty. These are tools bought once and kept for years, so a published warranty is a real signal rather than a formality.

Published figures, side by side

The pick: Andis T-Outliner (04780)

A magnetic motor published at 7,200 SPM behind a published carbon-steel T-blade, hardened for cutting life. Andis publishes the weight (14.5 oz) and a two-year warranty. It is the tool on most professional barber stations, and unlike most grooming products it earns that on figures you can check.

Corded is not a compromise here, which is worth saying because it looks like one on a spec sheet. A lineup is a stationary job done in front of a mirror; a cord costs you nothing and removes a battery that fades mid-line and eventually dies.

The honest cons. It is tethered, and Andis does not publish the cord length - an odd omission on a corded tool. Magnetic motors buzz and vibrate more than rotary ones, which is fatiguing over a long session. Carbon steel rusts if it is left wet, so oiling is an obligation rather than a suggestion. And no guards ship at this item number: it is an outlining tool, not a clipper.

The one most people should actually buy: Cordless T-Outliner Li

The same published 7,200 SPM from a rotary motor - quieter and smoother - with a lithium-ion battery published at one hour, and it runs corded as well, which removes the usual cordless objection entirely.

The number that decides it for home use is the weight: 7.8 oz against the T-Outliner's 14.5 and the GTX's 17.5. Cutting your own nape means holding a tool behind your head, working in a mirror, with your wrist at an angle it does not like. Half the weight is a bigger practical difference than any motor spec on this page. Andis also publishes its dimensions and four comb sizes.

The honest cons. Charge time is not published, which is the other half of the battery question and a real gap. Andis lists carbon steel, stainless and ceramic as replacement blades without stating which ships on it - so the material this page ranks on is unknown for this model. A battery is a wear item on a tool otherwise built to last decades.

If you want guards too: GTX T-Outliner (04785)

Same published 7,200 SPM magnetic motor in a heavier 17.5 oz body, published as Made in USA, with four attachment combs included - 1/16, 1/8, 1/4 and 3/8 inch - and a deep-tooth carbon-steel replacement blade published as an option.

The guards are the reason to pick this one: it can take a small amount of length off as well as set a line, which makes it closer to a single-tool solution for a short cut.

The honest cons. At 17.5 oz it is the heaviest tool here, and lineup work is wrist work. Andis states the material for the deep-tooth replacement blade but not for the standard blade that ships on it. Corded, again with no published cord length. And a deep-tooth blade bites harder, which is the wrong instinct for anyone still learning.

The adjustable one, and why it is the skip

The Wahl 5-Star Detailer is a genuinely well-regarded professional tool: a rotary motor behind the #2215 adjustable T-wide blade, a published 8-foot chemical-resistant cord - the only published cord length on this page - and three extra-wide guides.

It is the skip for a first purchase for three published reasons. Wahl gives no SPM figure at all, so its motor cannot be compared with the Andis tools on the one spec this category actually discloses. Its published warranty is 1 year against Andis's 2. And the adjustable blade - the feature people buy it for - is a blade you can set too close. On a hairline, a blade sitting proud of its guard is not a bad haircut; it is a cut.

Getting a line that is actually straight

• Dry hair, always. Wet hair lies flatter and springs back, so the line you cut is not the line you get.
• Follow your existing hairline, do not invent one. The most common self-inflicted mistake is straightening a naturally uneven hairline, which means going backwards - and it does not grow forward again.
• Blade flat to the skin, then lift into the line. Leading with the corner digs in.
• Small movements, and check in two mirrors. Especially at the nape, where you cannot see what you are doing - that guide is worth reading first.
• Brush out and oil after every use. Carbon steel plus damp equals rust, and a rusty blade pulls. The maintenance routine is here.

And the one on this page that is not a T-blade at all: the Wahl Magic Clip is included as the clipper half of the pair, because a lineup tool cannot cut your hair and a clipper cannot cut your line. Most people who think they need a better trimmer actually need both tools.