Formal Assessment of Agreement and Similarity between an Open-Source and a Reference Industrial Device, with an Application to a Low-Cost pH Logger

• DOI: 10.20944/preprints202312.1372.v1
• Publication Date: 2023-12-20T00:59:51Z
• Authors: Evmorfia P. Bataka; Persefoni Maletsika; Christos T. Nakas
• Keywords: Similarity (geometry); pH meter; Data logger

Open-source devices are nowadays used in a vast number of research fields like medicine, education, agriculture, and sports among others. In this work, an open-source, portable, low cost pH logger, appropriate for situ meas-urements was designed developed to assist experiments on agricultural produce manufacturing. Τhe device calibrated manually using buffers values 4.01 7.01. Then it tested by measuring from the juice citrus fruits. A waterproof temperature sensor added compen-sation when pH. formal method comparison process between open-source Hanna HI9024 Waterproof Meter assess their agreement. We derived indices agreement graph-ical assessment tools mixed-effects models. Advantages disadvantages interpreting through proposed procedure discussed. our illustration, reported mediocre subsequent similarity analysis revealed fixed bias 0.22 units. After recalibration, im-proved excellent levels. The can be followed general avoid misleading or over-simplistic results studies reporting solely correlation coefficients purposes.