| Country of Origin | United States |
|---|---|
| Brand | Heathkit |
| Model | IT-17, IT-21, IT-3117, TT-1, TC-3 |
Check the listing for details. Heathkit Tube Tester Replacement Roll Chart Window with Red Line. Condition: New, Made in United States. Listed at 34.99 USD. Known compatible models are TT-1, TC-3, IT-17, IT-21 and IT-3117. The plastic is 0.0285" (0.73mm) thick, and is slightly thicker than the original to inhibit warping. Paper roll must be removed to correctly install.
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