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Captive Purity Portable pH Pen/Meter

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CP2131

This item has been discontinued.

Captive Purity

This handy pH pen/meter is a great tool for any aquarist. It is extremely easy to use and is waterproof. Simply dip the meter in the solution to get the pH reading. Its high accuracy and resolution also make it suitable even for the most-demanding applications.

Note: pH 7.0 solution is required for calibration.

Specifications:

  • Large Readout Display
  • Range: 0.0-14.0 pH
  • Resolution: 0.01 pH resolution
  • Accuracy: +/- 0.05 pH
  • Fixed Electrode
  • Operating Temperatures: 5`C to 50`C
  • ATC: Automatic Temperature Compensation for accurate readings!
  • Power Supply: 3 x 1.5 Volt (Button Battery)
  • Battery Life: 500 hours of continuous use
  • Size: 6" x 1.00" Largest Diameter
  • Weight: 70 Grams


Product Manuals & Documentation

Captive Purity Portable pH Pen/Meter

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

Captive Purity manufactures water filtration and water testing supplies for marine and reef aquaria. The brand is best known for their high-quality line of reverse osmosis filter systems and accessories. Captive Purity also produces refractometers for testing salinity, portable pen-sized meters for testing pH as well as replacement filter media for their RO and RO/DI filter systems.

MALCOM GIBSON from FARINGDON, UNITED KINGDOM

05/23/2011

Experience Level: Expert

Short life

Had this for six months. Was recieved and stayed within 0.1 at the 4,7 and 10 level. Worked a charm until..a 2 unit shift after six months and way off calibratable use. Batteries still at the 6 volt level. Very hard to recommend it now.

1 out of 1 found this review helpful

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FRED SHIMMEL from HAVELOCK, NC UNITED STATES

03/12/2011

Experience Level: Expert

not accurate

this pen meter doesn't calibrate accurately , ph buffer 4 cals good but then the ph buffer 7 will only go up to 6.8 and check of ph 10 buffer is only 9.5 . It will be ok for acidic solutions but not Base.

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DAN from

04/20/2010

Experience Level: Intermediate

Imposible to calibrate

I thought the Pinpoint PH meter was difficult to calibrate but this one is at least as hard. You have to open the end cap and remove the battery (which consists of 4 "watch-batteries" - don't know what they are called - which is odd in itself) to get to the 4ph and 7ph screws. You have to go back and forth between the two solutions 5 times and then it will still not be acurate. The inside shows that it is extreme cheaply made. I am going back to my Pinpoint PH meter. I guess that was a waste of money.

1 out of 1 found this review helpful

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JIMMY HOLMES from FRESNO, CA UNITED STATES

06/22/2009

Experience Level: Beginner

This is fantastic

I have only had this meter a week but so far it has been great. I work at a wastewater treatment plant and I took this pH meter to work and ran it next to the lab meter we have there. This meter was so accurate it wasn't even funny. It would be nice to have push button calibration but for this price I am not complaining. This is a great little meter and worth the price.

3 out of 4 found this review helpful

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Dr.HIDY HIRAOKA, PhD from OAKLAND, CA UNITED STATES

05/21/2009

Experience Level: Expert

Portable pH Pen Meter

I found this pH meter is accurate and very easy to use. This meter gives you read-out at 1/00 th accuracy. I don't like to compare the color with a chart every-time. It is easy to carry with you. Reviewed by Dr. Hidy Hiraoka, PhD in Science & Engineering

1 out of 2 found this review helpful

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Mynd from MOUNTAINSIDE, NJ UNITED STATES

01/21/2008

Experience Level: Expert

Excellent for Nano Reefs

I really like this meter. Works well and you can actually just stick it in the bottle of calibration fluid and let it sit there while calibrating. I have used pinpoint meters before and enjoyed having the probe in the water all the time. However, now with a nano it is easier to just pull out the pen and inside of 30 seconds have an accurate ph reading.. clean off and put it away. Wish they made one for DKH ( that would be awesome ), Magnesium and Calcium, then I would be set.

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Randy from DUBLIN, OH UNITED STATES

09/21/2007

Experience Level: Expert

Returning product

I returned the portable pH meter because it could not be calibrated according to directions.

8 out of 8 found this review helpful

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MERLE STEWART from VIRGINIA BEACH, VA UNITED STAT

09/19/2007

Experience Level: Intermediate

Works Great, On Second Try

It works really well but the first one i recieved would not calibrate to specified PH setting so I had to return for a new one , so two weeks later (because i live on east coast) I got my new one and it works great. Would recommend.

5 out of 5 found this review helpful

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