No. It's an instrument. It needs to be tuned. https://www.amazon.com/15-Pack-Buffer-Solution-Accurate-Calibration/dp/B075L6TF1V/ref=mp_s_a_1_2?ie=UTF8&qid=1550100627&sr=8-2-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=ph+calibration+packets&psc=1