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| Model Number | PTK-440 | PTK-640 | PTK-840 | PTK-1240 |
| Cordless, Battery-Free Pen Technology | Patented EMR (Electro magnetic resonance) |
Patented EMR (Electro magnetic resonance) |
Patented EMR (Electro magnetic resonance) |
Patented EMR (Electro magnetic resonance) |
| Includes Grip Pen and Mouse | yes | yes | yes | yes |
| Interface | USB | USB | USB | USB |
| Wide Format | yes | yes | yes | yes |
| Ambidextrous | yes | yes | yes | yes |
| Active Area (W x D) |
6.2 x 3.9 in 157.5 x 98.4 mm |
8.8 x 5.5 in 223.5 x 139.7 mm |
12.8 x 8.0 in 325.1 x 203.2 mm |
19.2 x 12.0 in 487.7 x 304.8 mm |
| Tablet Dimension (W x D x H) |
12.2 x 8.2 x 0.5 in 309 x 208 x 12 mm |
14.6 x 10.0 x 0.5 in 370 x 254 x 12 mm |
18.7 x 12.6 x 0.6 in 474 x 320 x 14 mm |
24.5 x 18.2 x 1.1 in 623 x 462 x 28 mm |
| Tablet Weight | 1.54 lbs (0.7 kg) | 2.20 lbs (1.0 kg) | 3.96 lbs (1.8 kg) | 7.72 lbs (3.5 kg) |
| Pressure Sensitivity Levels | 2048 | 2048 | 2048 | 2048 |
| Tilt range (all pens) | ± 60 degrees | ± 60 degrees | ± 60 degrees | ± 60 degrees |
| Resolution | 5080 lpi (lines per inch) | 5080 lpi (lines per inch) | 5080 lpi (lines per inch) | 5080 lpi (lines per inch) |
| Maximum Report Rate | 197 pps (points per second) |
197 pps (points per second) |
197 pps (points per second) |
197 pps (points per second) |
| Pen Accuracy | ±0.01 in (±0.25 mm) |
±0.01 in (±0.25 mm) |
±0.01 in (±0.25 mm) |
±0.01 in (±0.25 mm) |
| ExpressKeys™ | 6 | 8 | 8 | 8 |
| ExpressKey Illuminated Displays | 0 | 8 | 8 | 8 |
| 4-Function Touch Ring | yes | yes | yes | yes |
| Radial Menus | yes | yes | yes | yes |
| Precision Mode | yes | yes | yes | yes |