Regular and precise weighing of the colonies could provide useful information for the beekeepers. Short-term performance is a highly heritable trait and has a high correlation with the late season production that makes it possible to select the superior colonies in the early rearing season. Laborious direct weighing of the hives is the most disadvantage in using this method. The main objective of this research was designing a dynamometer to measure the relative weight of colonies instead of actual weight with a higher rate. Therefore, 30 randomly selected colonies from Educational Farm of Isfahan University of Technology were assigned. During the abundance of nectar, the colonies weight was measured at morning of 1, 7, 14 and 21 day. The short-term performance was recorded through the direct weighing of colonies via digital scale (gr) and, relative weighing of colonies were collected via hand-held dynamometer (gr). For measuring the relative weight of colonies, the front part of hives (flying gate) was elevated about 10 cm (at an angle of 35°) using hand-held dynamometer. Egg laying rate, offspring numbers, population, defensive behavior, swarming behavior, and also pollen and honey production were measured. Phenotypic correlation coefficients in this study for short-term performance evaluation was 0.8 which was significant at 0.01. Based on the results, correction of the determination coefficient indicated that the 69% of the actual weight changes were justifiable by using relative weights. Linear regression coefficients between the weight variable using designed dynamometer and actual weight was significant (P 0.01) and showed a linear relationship between the weights. The rate of determination coefficient indicated that 62% of the changes in the actual weights were justifiable by the weights measured using designed dynamometer. The average of comparisons revealed that the maximum weight was in August, although there was no significant difference in September. The results also demonstrated that there were significant linear, quadratic and cubic relations (P 0.01) between the weighting methods. Hence, rate of increased weight of hives per month was not constant across the months. Results of ANOVA for honey production, population, offspring numbers and pollen production indicated that there are a high diversity between the hives. The average of defensive behavior was 3.89. There was no any significant correlation between the swarming behavior and honey production as well. Keywords : Beehives, Actual weight, Relative weight, Short-term performance