Abstract
The purpose of this research is to develop a digital Vertical Jump measuring instrument. This is because so far there are often errors in data collection related to the ability of leg muscle explosive power that is done conventionally. Resulting in a conclusion that is less valid. And therefore it is necessary to develop an instrument based on digital leg muscle power that is effective in its use and is economically efficient. This research is a development study with a design model adapted from Borg & Gall. Samples of Faculty of Sport Science (FIK) students of Padang State University, amounting to 10 people for small groups and 40 people for large groups, and 6 experts as validators as a validation tool. Data was collected using a questionnaire and trial tool. Through the validity of the product moment test and the reliability test, Test and Retest. The process of developing and testing this tool was carried out with the validation of experts by using a questionnaire as an instrument of validation and the results obtained an average percentage of 91%, the results of small group trials obtained a correlation level of 0.98 and the reliability test with direct trials of 0, 99 with the category of reliability is very strong.
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