Slab Weight Verifier
Is your graded slab authentic? Select the grading company and holder type, enter the measured weight, and instantly see whether it falls within the expected range. Includes visual authentication checks for every company.
Select Grading Company
Select Slab Generation / Era
Each grading company has released different holder designs over the years. Select the one that matches your slab.
Visual Authentication Checks — PSA
Weight is only one data point. Always perform these visual inspections alongside the weight test.
Label Quality
Authentic PSA labels have crisp, clear printing with no bleeding or smudging. The set name and card number should be perfectly aligned.
UV Glow
Under UV (blacklight), genuine PSA holders exhibit a specific fluorescence pattern. Counterfeits often glow differently or not at all.
Case Seam
The ultrasonic weld seam on authentic PSA slabs is smooth and consistent. Look for uneven seams, bubbles, or rough edges as red flags.
Hologram
PSA holders feature a holographic sticker with the PSA DNA logo. It should shift colors when tilted and be impossible to peel without damage.
Font Consistency
The fonts on genuine PSA labels are proprietary. Compare to known authentic slabs — fake labels often use slightly different letter spacing or weight.
Weight Reference Table — All Companies
| Company | Slab Type | Expected Weight |
|---|---|---|
| PSA | Current (2020+) | 50-56g |
| PSA | Current Thick | 58-65g |
| PSA | Vintage Holder (2016-2020) | 48-54g |
| PSA | Old Holder (pre-2016) | 46-52g |
| PSA | Oversized | 85-100g |
| BGS | Standard | 55-62g |
| BGS | Thick (Jersey/Relic) | 68-78g |
| BGS | Vintage | 52-58g |
| CGC | Standard | 52-58g |
| CGC | Oversized | 80-95g |
| SGC | Standard Tuxedo | 48-55g |
| SGC | Vintage | 46-52g |
Slab Authentication Tips
- 1. Use a digital scale accurate to at least 0.1g for reliable weight measurements — kitchen scales are too imprecise
- 2. Weight alone never confirms or denies authenticity — always combine with visual checks, cert verification, and hologram inspection
- 3. Relic, patch, and jersey cards will be heavier than standard cards in the same holder type due to the thicker card stock
- 4. Always verify the certification number on the grading company's official website before purchasing any high-value slab
- 5. When buying at shows or meetups, bring a small pocket scale and a UV flashlight — the two cheapest tools that catch the most fakes
Frequently Asked Questions
Can you authenticate a graded slab by weight alone?
No. Weight is one useful data point but should never be the sole factor in authenticating a slab. Counterfeiters have become increasingly sophisticated, and some fake holders may fall within the correct weight range. Always combine weight verification with visual inspection of the hologram, label quality, case seam, UV test, and certification number lookup on the grading company's official website.
Why do PSA slabs from different eras weigh different amounts?
PSA has changed their holder design and materials multiple times over the years. The pre-2016 "old" holders used thinner plastic and a different label stock, resulting in lighter slabs (46-52g). The 2016-2020 "vintage" holders were slightly heavier (48-54g), and the current holders introduced in 2020 use a denser plastic compound and updated label, bringing the weight to 50-56g for standard cards.
What scale should I use to weigh graded card slabs?
Use a digital pocket scale or jewelry scale with at least 0.1g precision and a capacity of at least 200g. These typically cost $10-$20 and are accurate enough for slab verification. Avoid kitchen scales, which usually only measure to the nearest gram and introduce too much error. Calibrate your scale before each use with the included calibration weight for the most accurate results.
Why would a genuine slab weigh more than the expected range?
The most common reason is card thickness. Relic cards, jersey cards, patch cards, and thick memorabilia inserts add significant weight to the slab. Some vintage cards on thick cardboard stock can also push the weight slightly above the standard range. Additionally, PSA "thick holder" variants accommodate thicker cards and weigh 58-65g compared to the standard 50-56g. Always select the correct slab type when checking weight.
Are BGS slabs heavier than PSA slabs?
Yes, generally. BGS standard slabs weigh 55-62g compared to PSA's current standard of 50-56g. This is because BGS uses a slightly different holder design with more material in the case construction. BGS thick holders for jersey and relic cards are even heavier at 68-78g. The weight difference between companies is one reason it's important to select the correct company and holder type when using a weight verification tool.
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