When writing a professional evaluation for a lab class, it's important to focus on the objectives of the lab and how well those objectives were met. Here's an example of a 50-100 word evaluation:
"In this lab class, students were able to successfully apply theoretical concepts to practical experiments. They demonstrated an understanding of lab safety protocols, utilized proper lab techniques, and effectively communicated their results. However, there were some areas for improvement, such as more thorough data analysis and better documentation of procedures. Overall, the class showed a strong effort towards meeting the lab objectives and improving their skills in scientific experimentation."