www.hannainst.com

The Hanna pH meter seems working very well in our lab. But this ORP meter is definitely a disappointment.

Waiting for a reply to my email

Quick checkout and shipping. All 3 units were out of tolerance out of the box and had to be sent out for calibration.

I am disappointed. Does not match several chemical pH testers, hard to calibrate, required complicated storage for the sensor.

This recent probe lost accuracy fast. Not sure if I was sold a lemon. I’ll have to buy another shortly. If the next one doesn’t last at least one year I’ll e changing brands