Recommendation for pH pen?

[Malia Rivera]

I would be grateful for any recommendations for a reliable handheld pH pen that is durable enough for high school students or early undergraduates to use. I have been thru several different models and either they don't work well or they are too fragile for students. Any thoughts out there? We are measuring seawater pH.

 

[SROPE]

A price range would help.

 

[Malia Rivera]

Hi, thanks for your reply. Well, the price range depends. I have typically spent about $100 per. I would "invest" in up $200 per but only if they are durable. Conversely, if there is a "cheap" version available that I could replace say semi annually or annually, I would consider that in lieu. I need about 12-15 per year! Any thoughts?

 

[SROPE]

Oakton EcoTestr pH 2 Waterproof pH Tester, 0.0 to 14.0 pH Range
Durable and should last over a year with care.

 

[Malia Rivera]

Great thanks for the recommendation. Really appreciate your quick response! If it is not too much trouble, can you say why you recommend these? I assume you have used them yourself? My issues with other models have been students shattering probes and/or lack of accuracy even with careful maintenance.

 

[SROPE]

I work at a municipal RO water treatment plant. This is the model we hand out to fellow employees to do on site testing.

 

[Randy Holmes-Farley Verified Community Expert]

I don't have a specific brand recommendation, but be sure it has two (or more) point calibration.