The OMRON Body Logic hand held body fat analyzer model HBF-306BLŠ is an inexpensive, portable, non-invasive, battery operated instrument that measures body fat percentage via electrical impedance. The manufacturer claims that the OMRON portrays reliable body fat measurements if a person undergoes testing under standardized conditions of hydration and blood circulation. These conditions include avoiding vigorous exercise, bath or sauna; and/or drinking alcohol or large quantities of water for at least two hours before testing. The purpose of this study was to test the validity of the OMRON Company's claims by comparing the OMRON body fat analyzer to the Jackson-Pollack Skinfold method of estimating body composition. Both Skinfold and OMRON data were collected on two cohort samples consisting of 140 females and 88 males from 12 laboratory sections of a university core healthy lifestyles course. The subjects ranged in age from 18 to 21. Prior to data collection, students were apprised of the purpose of the study, and asked to adhere to the OMRON measurement standards before testing; individuals who failed to adhere to these directions were eliminated from the analysis. To minimize measurement error, one exercise science faculty member with expertise in Skinfold measurement collected and analyzed all of the Skinfold data while another collected all of the OMRON data. Both sets of data were collected during the same testing sessions, and in laboratory sections that convened in mid-morning and mid-afternoon to best comply with OMRON measurement collection guidelines. Means (M), standard errors of the mean (SEM) and standard deviations (SD) were calculated for respective male/female Skinfold/ OMRON measurements: (males) M = 12.62/16.04, SEM = .67/.86 and SD = 6.30/8.05; (females), M = 23.53/23.49, SEM = .58/.58, and SD = 6.84/6.87. Simple linear regression procedures were performed on each cohort and were significant for both males (R = .83 (p < .001), R2 = .685) and females (R = .91 (p < .001), R2 = .83). The following regression equations were developed: males - Predicted Skinfold Measurement = 2.225 + .648 (Omron Score) + residual; females - Predicted Skinfold Measurement = 2.280 + .904 (Omron Score) + residual. Results suggested that the OMRON measurement, when utilized under standardized conditions, provided a more reliable body composition estimate for the females than the males in this cohort sample. These results should be scrutinized carefully, and similar experiments should be conducted to verify current findings.Keyword(s): adult physical activity/fitness, measurement/evaluation, research