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The study's main objective was to evaluate the colostrum quality (immunoglobulin G, IgG) at birth (0 h) and 3 h and 6 h after calving with different measurement devices foloving the comparison of the results among them. Colostrum samples (n = 63) were collected from 21 dairy caws. The colostrum quality was evaluated with a colostrometer and digital and optical refractometers. Digital and optical refractometers showed no significant (P > 0.05) diference in obdeind results, while colostrometers exhibited significantl (P ≤ 0.05) lower concentrations of IgG. Differences were detected in all three considered times. The colostrometer proved to be less accurate. The optical refractometer proved to be the most useful for on-farm assessment because the results were comparable to the digital and it was affordable.