nitrate monitor

[Just Jim]

I've got an American Marine Pinpoint Nitrate Monitor that's just been laying around since I got it as a part out. I was thinking about selling it and can't quite figure it out. I went through the high calibration steps, and now it reads h191. Anyone see this before? I can't find much info on these monitors....

 

[LouZ]

sounds like the calibration fluid may be old

PM me if you want to sell

 

[Just Jim]

sounds like the calibration fluid may be old

PM me if you want to sell[/QUO

The solution is old, but the display says H19H, not err. I have found NOTHING on this message. And yes, if I figure it out and it works properly it is listed in the equipment for sale forum.

 

[Just Jim]

It actually read H19H , hasn't anyone seen this?