Review on Accuracy Measurement Household Drinking Aquarium Kitchen & Dining by Miriam Davis

I followed the directions and made the buffers using the bags provided and distilled water. I then calibrated the first buffer solution, 6.86, and then repeated this for the other two. For calibration, I rinsed with distilled water after each buffer solution. At the end of g I lowered the pH meter into the first solution and it read 5.85. I dove into the first solution and it showed 3.96, dove into the final solution and it came out 7.4. I rinsed again and recalibrated, again cleaning with distilled water between dives. I calibrated with all three solutions and then tested in buffer solutions and still got orders of magnitude wrong. This device is not suitable for me.