A. This food pH meter has been tested before leaving the factory, and its electrode is resistant to strong acids and alkalis. The sponge in the electrode cap contains a small amount of protective liquid. After each use, the probe needs to be cleaned and dried, and then the electrode cap should be put on to maintain the sensitivity of the probe. B. This pH meter for food measurement uses a replaceable spear - shaped probe, which is easy to maintain. Compared with ordinary probes, it is more sensitive and has a wider testing range. C. It is equipped with a high - sensitivity spear - shaped probe, with a measurement range of 0 - 14pH and a resolution of 0.01pH. Through the three - point calibration program and the automatic temperature compensation function from 0.1 to 60, the pH meter can automatically identify the calibration solution and give readings quickly. D. This food pH meter has been calibrated at the factory and can be used directly. The electrode cap contains protective liquid. If it is not used for a long time, the battery needs to be removed and the electrode cap should be put on. It needs to be calibrated before use again. E. This food pH meter is suitable for testing the pH values of soft solid samples such as cheese, sushi rice, meat, fruits, dough, bread, skin care products, and solid culture media. It is also suitable for the routine pH testing of general aqueous solutions.