Additional information
| Attribute 1 | The Abney Level is an engineering instrument which can be used to determine height. It is moderately priced and of medium size and weight. Although the Abney Level is relatively robust, the bubble can be knocked out of alignment during rough treatment. |
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| Attribute 2 | When used correctly, the Abney Level has an accuracy of about +/- 0.5m for a 20m tall tree (about 2.5%). |