Can centering be corrected?

No. Centering comes from how the card was cut at the factory: no restoration changes it. That is why you measure it before paying for grading, not after.

How do you measure e-Reader cards?

e-Reader cards have deliberately asymmetric margins. You don't compare opposite borders as on a standard card: you pair the two wide borders, left and bottom, and the two narrow ones, top and right.

Do you need a microscope to read centering?

It isn't required, but it helps. A single misread number changes the ratio: confirm the naked-eye reading under magnification when the card is close to the limit.

How to measure Pokémon card centering before grading

Q: What centering does a PSA 10 need?

On the front, the tolerance given for a PSA 10 is around 55/45. PSA does not publish its thresholds as rigid numbers and also weighs eye appeal, so the measured ratio is a guide, not a guarantee of the grade.

How to measure a Pokémon card's centering with a numbered overlay: reading the borders, the percentage table, e-Reader cards and the PSA 10 tolerance.

In short: you measure centering with the card held still in a holder and a clear overlay with numbered lines on top. Read the number each border falls on, compare opposite borders in the percentage table starting from the higher value, and check the ratio against the grade's tolerance. For a PSA 10, the front tolerance is around 55/45.

Surface, edges and corners can be cared for. Centering can't: it depends on how the card was cut at the factory, and no restoration moves it by a millimetre. That's why it pays to measure it before paying for a submission. A card with a perfect surface but poor centering won't reach a 10, and you only find out when the grade is already printed on the slab.

This is the method Dr. Gabriele Blanca, biologist and restorer, shows in the eighth and final episode of the Spark & Polish Academy, on three very different cards.

What you need

A holder that keeps the card still and always in the same position.
A clear PVC overlay with numbered lines that fits over the card.
A microfibre cloth: a single speck of dust under the overlay is enough to shift the reading.
The percentage table, which turns two numbers into a ratio such as 60/40.
Optional but recommended: a microscope to confirm borderline readings.

The tools used in the video

→ Kit Centering Tool — Supporto + Overlay PVC: holder, numbered overlay and microfibre cloth; the percentage table is in the included guide

→ Digital Card Inspector Microscope: to confirm the numbers when a card is close to the threshold

→ Micro Inspector Pocket Scope: the pocket version, plugs into your phone

How to read the overlay

Every line on the overlay is a number. Solid lines are odd numbers, dashed lines even ones: even looking at a single border, you can tell straight away which value it falls on.

Read all four borders: top, bottom, left and right. Then pair the opposite ones, left with right for the horizontal axis and top with bottom for the vertical one, and look them up in the table starting from the higher value.

Borders read	Ratio
1 and 1	50/50
2 and 2	50/50
3 and 2	60/40
3 and 1	75/25
4 and 1	80/20

The closer the ratio gets to 50/50, the better the centering. These are the examples from the video; the full table is in the kit's guide.

Step by step

Card in the holder. The card goes in bare. Wipe the dust off both the card and the holder with the microfibre cloth.
Overlay in place. Lay the overlay on and press until it sits fully in the holder: you should feel it click. A lifted overlay shifts every reading.
Naked-eye reading. For each border, the number of the line it falls on.
Confirm under the microscope. One misread number is enough to change the result. When you are near the limit, magnify.
Table and tolerance. Two ratios, horizontal and vertical, to compare with the grade you want.

Three cards, three cases

Suicune Neo Revelation, Japanese

Top border 1, right 1, left 1, bottom 1. A 1-1 ratio on both axes, so 50/50 horizontally and vertically: perfectly balanced centering, consistent with the requirements for a PSA 10.

Flareon e-Reader, Skyridge

Here the method changes. e-Reader cards have a layout with deliberately asymmetric margins and can't be read like a standard card. You distinguish two pairs: the two wide borders, left and bottom, and the two narrow ones, top and right. On the Flareon in the video the left reaches about 3, the bottom falls between 3 and 4, top and right line up with 1. A 3 to 1 ratio gives 75/25 on both axes; if the bottom really reached 4, the vertical would go up to 80/20.

Espeon ex, 30th anniversary

A modern card fresh from the pack, with a standard layout: back to reading opposite borders. A 1-1 ratio on both axes, 50/50. With the front tolerance of around 55/45 given for a PSA 10, it fully qualifies.

Tolerances, and why they are a guide

For a PSA 10, the front tolerance is around 55/45. PSA, however, doesn't publish its thresholds as rigid numbers and also weighs overall eye appeal: the ratio you measure tells you whether the card is inside or outside 10 territory, it doesn't guarantee the grade. What it does guarantee is something else: you won't pay to send in a card that is out from the start.

Common mistakes

Measuring with dust under the overlay. Wipe the card and the holder, every time.
An overlay that isn't seated. If it doesn't sit flush, the lines are off.
Reading an e-Reader like a standard card. The margins are asymmetric by design: pair wide with wide and narrow with narrow.
Trusting the first reading. When a border sits between two numbers, confirm under the microscope.

Watch the episode

The whole procedure, on all three cards, is in episode 8 of the Spark & Polish Academy, the last one of the free course. If you have watched all eight lessons, the final test is waiting on the course page: pass it and the Spark & Polish Academy PDF certificate arrives by email.

Before grading, take care of the rest too: how to prepare Pokémon cards for PSA grading and PSA vs Beckett vs CGC.