Dualex便携式植物多酚氮平衡指数测量仪是一款源自于法国国家科学院 (CNRS)及巴黎第十一大学技术，由奥地利PESSL公司生产（原法国Force-A公司）开发的新型多功能叶片测量仪。它可同时准确测量叶片的叶绿素含量、叶片表层的类黄酮和花青素含量，适用于植物生理学和农学（如水稻叶绿素浓度，玉米氮素状况，葡萄藤等）相关研究。
其测量对象可以是单子叶植物，双子叶植物或多年生植物。这款设备简单易用，可进行实时和非破坏性测量。由于不需要校准标定和事先的样品制备，测量工作可在实验室或现场完成。此外，该设备在各种温度的和环境光照条件下均可进行简单、快速、无损测量叶片中的叶绿素、多酚以及花青素。
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