This study presents the design and quantitative evaluation of a user-friendly operations manual developed for a low-cost portable Fire Detection and Alarm System (FDAS) trainer, aimed at enhancing practical learning in technical-vocational education. The manual was created to provide clear, concise instructions and support hands-on training for first-year Electrical Technology students. A structured survey questionnaire using a 5-point Likert scale was administered to 40 participants to assess the manuals usability across four dimensions: clarity of instructions, ease of use, task support, and perceived usefulness. The results revealed high overall usability, with an average mean score of 4.14 (SD = 0.50), indicating strong acceptance and satisfaction among users. The highest ratings were observed in perceived usefulness (M = 4.30, SD = 0.45) and clarity of instructions (M = 4.23, SD = 0.47), highlighting the manuals effectiveness in improving learner confidence and comprehension. Ease of use (M = 4.08, SD = 0.52) and task support (M = 3.95, SD = 0.58) were also rated positively, though some users suggested enhancements in troubleshooting guidance and navigation. These findings suggest that the operations manual is a valuable educational resource that facilitates independent learning and practical skills development in FDAS installation, testing, and troubleshooting. Recommendations include expanding troubleshooting content, improving visual aids, and optimizing manual layout to further enhance usability. This study contributes empirical evidence supporting the critical role of well-designed printed instructional materials in technical education, particularly in resource-constrained environments where digital tools may be limited. The manual serves as an effective bridge between theoretical knowledge and hands-on application, fostering learner autonomy and confidence.