Description:

Using the fourth generation hp meter measurement technology, high precision (precision guarantees three decimal places such as 7.000 or 14.000)

-40-85 degrees guarantees very low bias current with low offset voltage and temperature drift. The input part of the circuit has been specially processed to meet the ph meter requirements, with a 3ppm ultra-low temperature drift reference and a 20bit high precision adc The board is equipped with a negative voltage charge pump. It only needs a single 5V power supply. The adc can be directly connected to the single-chip microcomputer. It can easily measure the slight change of ph. The precision exceeds 93% of the finished ph meter. It has excellent performance and is extremely cheap. Ten yuan price can get the performance of thousands of instruments