| Year of introduction | 2004 |
| Function | Construction: sheet metal work |
| Model Number | 4090 |
| Power | 2 LR-44 batteries |
| Original Price | $53.00 |
| Photo credit | Mark Bollman→ |
Sheet Metal/HVAC Pro
| Year of introduction | 2004 |
| Function | Construction: sheet metal work |
| Model Number | 4090 |
| Power | 2 LR-44 batteries |
| Original Price | $53.00 |
| Photo credit | Mark Bollman→ |
The Sheet Metal/HVAC Pro calculator is certainly very highly specialized. It is licensed to the International Training Institute, a training agency for sheet metal and air conditioning professionals, and intended for the exclusive use of members of the Sheet Metal Workers' International Association. In addition to a full set of specialized keys for situations as arise in HVAC calculations--including three fan laws--it is preprogrammed with the Pythagorean theorem (x, y, and r keys in the top row).
The Sheet Metal/HVAC Pro calculator stands out among CI calculators for its algebraic logic. On this calculator, pressing the keys 2 + 3 × 5 = yields the correct answer of 17, not the value 25 returned by a calculator with arithmetic logic.
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