Laboratory courses are typically divided into several sections each led by different teaching assistants, raising questions about consistency of grading across sections. Previous work has demonstrated that TAs can assign a wide range of grades for similar work in engineering courses, resulting in what one set of authors called the "TA lottery" for students [1]. Other authors have noted that writing assignments might be especially prone to inconsistent grading in STEM fields, as many graduate TAs may not have received formal training in writing assessment, while some may even lack confidence in their own writing skills, perhaps because English is not their native language Given that many