P H meter would you recommend

Roger A. Shrubber

Well-Known Member
i bought a cheap one off of amazon 3 years ago, and a bottle of test solution. i check it every three months and its never been more than a couple of points off. if you have the money for a nicer one, get one, but the cheap ones work, as long as you check them regularly
 

xtsho

Well-Known Member
I've gone through a few of the cheap ones over the years. They work until they don't. I just had one of the cheap ones go haywire and had to get another immediately. The only one they sold at the shop down the road was a Blue labs. It's a great PH pen. It cost about $80 but it's a very well built device. I probably would have bought a cheaper one if they had it but I'm happy with the Blue lab.
 

dstroy

Well-Known Member
I have a bluelab guardian monitor, and an HM digital ph-200. The guardian monitor works really well, so does the pH pen.

The replacement electrodes are fairly inexpensive for the pen ~$28, and they don't last forever. They last a while if they are properly taken care of.

The difference between a monitor and a meter. A monitor is something that stays in solution constantly measuring, a meter is for taking a measurement periodically and then it gets cleaned and stored.

You can't calibrate too often, but you'll go through a lot of reference solution.

Always start the calibration procedure with the pH 7 solution (known as the zero), and end with the pH 4 solution (known as the slope), that is if you are measuring something expected to be in between pH 4 and pH 7. Using the reference solutions establishes the characteristics of the electrode, and then the pen or monitor performs this equation http://www.ph-meter.info/pH-Nernst-equation for you, while automatically compensating for temperature in most cases.

More helpful info: http://www.ph-meter.info/pH-electrode-maintenance

NEVER store your electrode in distilled or deionized water!

Good luck :bigjoint:
 
I have a bluelab guardian monitor, and an HM digital ph-200. The guardian monitor works really well, so does the pH pen.

The replacement electrodes are fairly inexpensive for the pen ~$28, and they don't last forever. They last a while if they are properly taken care of.

The difference between a monitor and a meter. A monitor is something that stays in solution constantly measuring, a meter is for taking a measurement periodically and then it gets cleaned and stored.

You can't calibrate too often, but you'll go through a lot of reference solution.

Always start the calibration procedure with the pH 7 solution (known as the zero), and end with the pH 4 solution (known as the slope), that is if you are measuring something expected to be in between pH 4 and pH 7. Using the reference solutions establishes the characteristics of the electrode, and then the pen or monitor performs this equation http://www.ph-meter.info/pH-Nernst-equation for you, while automatically compensating for temperature in most cases.

More helpful info: http://www.ph-meter.info/pH-electrode-maintenance

NEVER store your electrode in distilled or deionized water!

Good luck :bigjoint:
Thanks for the information dstroy
 
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