| الملخص: | Roundness measurements are used to measure the cylindrical object, which refers to how closely the shape of the object approaches a perfect circle. Measuring the roundness requires a device that can perform measurements with precision. In this study, a roundness measuring machine is used to check the roundness of the object. However, it is difficult for engineering students to operate the machine as most of them lack the necessary skills and information. A set of questionnaires was distributed to 93 students to determine their level of ability to conduct the roundness measurement using a roundness measuring machine. The result showed that students (89.2%) claimed that they tried to operate the machine correctly but found some parts that were difficult to understand. Therefore, mobile augmented reality (AR) was created to support students in operating the machine. Most students have mobile phones for teaching and personal use. In this study, mobile AR with audio was used to guide the students on how to operate the machine. The effectiveness of mobile AR was then investigated. Thirty students were selected to operate the machine using mobile AR. Results demonstrated that 76.7% of students were satisfied when using the mobile AR for the first time, with no mistakes. The results suggest that mobile AR is effective and useful in engineering measurement. © 2023 Penerbit UTM Press. All rights reserved.
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