Our IRS alcohol hydrometers use the Proof scale and comply with IRS specifications.
Specifications Chart
| Item No. | Proof Range | Subdivision | Tolerenace | Internal Revenue Size | Length |
| 6613-B | 80 to 120 | 0.5 | ±0.5% | B | 9.1 in. (230 mm) |
| 6613-F | 0 to 20 | 0.2 | ±0.3% | F | 12 in. (305 mm) |
| 6613-G | 20 to 40 | 0.2 | ±0.4% | G | 12 in. (305 mm) |
| 6613-H | 40 to 60 | 0.2 | ±0.4% | H | 12 in. (305 mm) |
| 6613-I | 60 to 80 | 0.2 | ±0.3% | I | 12 in. (305 mm) |
| 6613-K | 75 to 95 | 0.2 | ±0.3% | K | 12 in. (305 mm) |
| 6613-L | 90 to 110 | 0.2 | ±0.3% | L | 12 in. (305 mm) |
| 6613-M | 105 to 125 | 0.2 | ±0.3% | M | 12 in. (305 mm) |
| 6613-N | 125 to 145 | 0.2 | ±0.3% | N | 12 in. (305 mm) |
| 6613-P | 145 to 165 | 0.2 | ±0.3% | P | 12 in. (305 mm) |
| 6613-Q | 165 to 185 | 0.2 | ±0.2% | Q | 12 in. (305 mm) |
| 6613-R | 185 to 206 | 0.2 | ±0.2% | R | 12 in. (305 mm) |
