Assessing lower extremity muscle strength objectively is essential for identifying imbalances, tracking progress, and supporting rehabilitation. This study evaluated the intra-rater reliability of two low-cost tension devices and their validity compared to a hand-held dynamometer (HHD) for measuring hip and thigh strength. Nineteen healthy adults (11 females; age = 24.2 ± 3.3 years; height = 1.70 ± 0.08 m; mass = 77.4 ± 14.8 kg) completed isometric strength tests for hip extension, abduction, internal and external rotation, and knee extension using the HHD (reference standard) and two low-cost devices (Tindeq Progressor, digital crane scale). Reliability was excellent for the Tindeq Progressor (intraclass correlation coefficients [ICC]=.929-.989) and digital crane scale (ICC=.904-.963). Both devices showed excellent validity (Pearson`s r or Spearman`s p = .892-.976) with no meaningful bias in agreement analysis (Bland-Altman plots). These findings suggest the Tindeq Progressor and digital crane scale are reliable, valid, and accessible options for objectively assessing hip and thigh strength in uninjured adults.
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