The Short Answer
- The 4-point inspection covers centering, corners, edges, and surface — the same criteria PSA and BGS use
- Essential tools: 10x jeweler's loupe ($15), 5500K LED desk lamp ($25), digital caliper ($10), centering gauge ($8)
- Centering must be 55/45 or better for PSA 10; use a digital caliper or centering gauge to measure border widths
- Corner whitening is the #1 reason Pokemon cards fail PSA 10 — inspect all four corners under 10x magnification
- Surface scratches and print lines are invisible to the naked eye but visible under angled LED light
- Only submit cards that pass all four criteria to avoid wasting grading fees on low grades
Tools You Need for Pre-Grading Pokemon Cards
Professional graders use specialized equipment. Here is the budget-friendly home equivalent:
| Tool | Purpose | Budget Option | Price |
|---|---|---|---|
| 10x Jeweler's Loupe | Inspect corners, edges, surface micro-defects | SE MJ3622L | $12-18 |
| 5500K LED Desk Lamp | Reveal surface scratches and holofoil defects | Any daylight LED | $20-30 |
| Digital Caliper | Measure border widths for centering | Neiko 01407A | $8-15 |
| Centering Gauge | Quick centering check without math | CardGrader or homemade | $5-10 |
| Black Light (UV) | Detect hidden whitening and repairs | 365nm UV flashlight | $10-15 |
Step 1: Measure Centering
Centering is measured as the ratio of border widths. PSA requires 55/45 or better for Gem Mint 10. For Pokemon cards, measure both the left/right borders and top/bottom borders.
Method:
- Place the card face-up on a flat surface under bright light
- Use a digital caliper to measure the left border width in millimeters
- Measure the right border width in millimeters
- Calculate: Left / (Left + Right) x 100 = front centering percentage
- Repeat for top and bottom borders
- Flip the card and repeat for back centering
PSA 10 standard: Both front and back centering must be 55/45 or better. A card with 60/40 front and 52/48 back will typically receive PSA 9 due to the back centering.
Quick tip: Modern Pokemon cards (Sword & Shield era and later) generally have better factory centering than vintage (Base Set era) cards.
Step 2: Inspect Corners
Corner whitening is the single most common reason Pokemon cards fail to achieve PSA 10. Here is how to inspect like a pro:
- Position: Hold the card at a 45-degree angle under your LED lamp
- Magnify: Use your 10x loupe on each corner individually
- Look for: Any white showing on the card stock at the corner tips
- Check both sides: Front corner condition does not guarantee back corner condition
PSA 10 corner standard: Perfectly sharp corners with zero whitening. A single touch of white on one corner typically drops the card to PSA 9.
Pokemon-specific tip: Holofoil cards show corner wear more visibly than non-holo cards because the holofoil layer chips away, revealing white stock underneath. Check holo cards extra carefully.
Step 3: Check Edges
Edge condition is often overlooked by new collectors but is critical for PSA 10. Here is the inspection process:
- Front edges: Run your loupe along all four edges looking for whitening, chipping, or rough cuts
- Back edges: Flip the card and repeat — back edge whitening is just as damaging as front
- Factory roughness: Some print runs (early Sword & Shield) have factory edge roughness that prevents PSA 10 regardless of how carefully the card was handled
PSA 10 edge standard: Clean edges with no whitening or chipping. A tiny chip on one edge typically results in PSA 9.
Black light test: Shine a 365nm UV flashlight along the edges. Fresh whitening fluoresces bright white under UV, making invisible edge wear visible.
Step 4: Examine Surface
Surface condition is the most complex criterion and where most Pokemon cards lose PSA 10 points. Two tools are essential:
Angled LED Light Test:
- Hold the card under your 5500K LED lamp at a shallow angle (10-15 degrees)
- Slowly rotate the card while watching the holofoil area
- Look for: scratches, print lines, clouding, and fingerprints
- Move the card closer and farther from the light to catch different defect angles
Common Pokemon surface defects:
- Print lines: Factory defects visible as straight lines across the card. Instant PSA 9 or below.
- Holo swirl scratches: Tiny scratches in the holofoil pattern. Often invisible head-on but visible at angles.
- Clouding: Dull or foggy areas in the holofoil. Common on cards stored in humid environments.
- Fingerprints: Oily residue from handling. Clean gently with a microfiber cloth.
PSA 10 surface standard: No scratches, print lines, or clouding visible under 10x magnification at any angle.
Score Your Card & Decide
Use this scoring rubric to estimate your likely PSA grade:
| Criterion | PSA 10 (4 pts) | PSA 9 (3 pts) | PSA 8 (2 pts) | PSA 7 or below (0-1 pts) |
|---|---|---|---|---|
| Centering | 55/45 or better | 60/40 | 65/35 | Worse than 65/35 |
| Corners | Zero whitening | 1 tiny touch | 2-3 minor touches | Visible whitening |
| Edges | Perfect | 1 minor flaw | 2 minor flaws | Chipping/whitening |
| Surface | Flawless | 1 light scratch | 2+ scratches | Print lines/clouding |
Scoring: 16 points = PSA 10 candidate. 13-15 points = PSA 9 candidate. 10-12 points = PSA 8 candidate. Below 10 = do not grade.
Final decision rule: Only submit cards scoring 14+ points (strong PSA 10 candidates) or cards where even PSA 9 adds significant value (vintage holos over $500 raw).
Frequently Asked Questions
How do I check the centering of a Pokemon card?
What tools do I need to pre-grade Pokemon cards?
What is the most common reason Pokemon cards fail PSA 10?
How can I tell if my Pokemon card has print lines?
Should I grade a Pokemon card with slight edge whitening?
Sources & Further Reading
With submission floors rising, pre-screening is no longer optional. Use our AI Pre-Grade Calculator to score a card's PSA 10 odds before you pay, and the Submission Planner to pick the right tier.