American Marine Pinpoint pH Monitor questions

**Soothing Shrimp** · 02-20-2013, 02:59 PM

OKay, I *think* I've decided to go with the American Marine Pinpoint pH Monitor, however I have some questions.

1) Does the probe always have to be kept wet? If so does it have to be in some special solution? Do I just buy a cup and keep it in that?

2) Does it have to be recalibrated every time I move it from freshwater sample water to freshwater sample water? Ie. Sample tank 1, Sample tank 2, etc?

**wkndracer** · 02-20-2013, 03:10 PM

Yes the probe must remain wet.
Mine simply stay in one of the tanks.

forgot (sorry) I recalibrate about twice a year.
Reference solutions are fairly cheap but after almost 4 yrs using a couple units I rarely see drift or slow response time shifts.

**Soothing Shrimp** · 02-20-2013, 03:16 PM

I don't have to recalibrate from tank to tank right? 'Cause I may test 25 tanks in a day.

**wkndracer** · 02-20-2013, 03:45 PM

Quote:

Originally Posted by Soothing Shrimp

I don't have to recalibrate from tank to tank right? 'Cause I may test 25 tanks in a day.

nope! recal without a probe change is rare. if you like once a month or so just check against one of the 4 or 7 solutions until you’re comfortable that it's holding without drift. If you don’t drop it or tweak the pots it should hold settings just fine.

**plamski** · 02-20-2013, 03:48 PM

It takes 5-10 min per tank to settle down the readings. You can buy cleaning solution and buffers to calibrate after cleaning. It is good sensor to be cleaned every 6 months to keep meter resize readings.

**Soothing Shrimp** · 02-20-2013, 03:51 PM

OKay. This is the one I'm gonna go with then. Thanks!

SBPyro · 02-20-2013, 05:21 PM

The lab use of pH electrodes, generally recommend calibrating prior to use. (Before taking readings of sample). No need to recal between samples. Do let the value stablize otherwise you can be reading drift (up to 5 minutes depending on electrode and sample matrix.). Keep the electrode stored in storage solution.
Just be aware the stds do expire so don't buy too much. The other thing bout glass pH electrodes is over time the glass resistance increases (electrode will go bad eventually). This can be accelerated by keeping in hot environment (50ºC is the max that any of the processes to assemble them.)

**Soothing Shrimp** · 02-20-2013, 05:35 PM

Good to know. Thanks.

dastowers · 02-20-2013, 06:54 PM

I use them on my tanks. Awesome to test multiple tanks with.

02-20-2013, 02:59 PM	#1
Soothing Shrimp Planted Tank Guru (View User Tanks) PTrader: (77/100%) Join Date: Nov 2011 Location: Illinois Posts: 3,534	American Marine Pinpoint pH Monitor questions OKay, I think I've decided to go with the American Marine Pinpoint pH Monitor, however I have some questions. 1) Does the probe always have to be kept wet? If so does it have to be in some special solution? Do I just buy a cup and keep it in that? 2) Does it have to be recalibrated every time I move it from freshwater sample water to freshwater sample water? Ie. Sample tank 1, Sample tank 2, etc? __________________ DBP Club! My thinking has been invert-ed!

02-20-2013, 03:10 PM	#2
wkndracer Planted Tank Guru (View User Tanks) PTrader: (68/100%) Join Date: Mar 2009 Location: Citrus County,Florida Posts: 6,046	Yes the probe must remain wet. Mine simply stay in one of the tanks. forgot (sorry) I recalibrate about twice a year. Reference solutions are fairly cheap but after almost 4 yrs using a couple units I rarely see drift or slow response time shifts. __________________ *The Fraternity of Dirt* If at first you don't succeed,,, keep kicking it RubberSideDownOnTheLanding, 2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g, Refugium, doghouse/newbie 2012 update adding table top pleco pans & a 90g (Nutz)

02-20-2013, 03:16 PM	#3
Soothing Shrimp Planted Tank Guru (View User Tanks) PTrader: (77/100%) Join Date: Nov 2011 Location: Illinois Posts: 3,534	I don't have to recalibrate from tank to tank right? 'Cause I may test 25 tanks in a day. __________________ DBP Club! My thinking has been invert-ed!

02-20-2013, 03:51 PM	#6
Soothing Shrimp Planted Tank Guru (View User Tanks) PTrader: (77/100%) Join Date: Nov 2011 Location: Illinois Posts: 3,534	OKay. This is the one I'm gonna go with then. Thanks! __________________ DBP Club! My thinking has been invert-ed!

02-20-2013, 05:21 PM	#7
SBPyro Planted Tank Obsessed (View User Tanks) PTrader: (26/100%) Join Date: Dec 2009 Location: Melrose, MA Posts: 338	I develop similar products The lab use of pH electrodes, generally recommend calibrating prior to use. (Before taking readings of sample). No need to recal between samples. Do let the value stablize otherwise you can be reading drift (up to 5 minutes depending on electrode and sample matrix.). Keep the electrode stored in storage solution. Just be aware the stds do expire so don't buy too much. The other thing bout glass pH electrodes is over time the glass resistance increases (electrode will go bad eventually). This can be accelerated by keeping in hot environment (50ºC is the max that any of the processes to assemble them.)

02-20-2013, 03:48 PM	#5
plamski Planted Tank Enthusiast (View User Tanks) PTrader: (53/100%) Join Date: Sep 2009 Location: Boca Raton,FL Posts: 882	It takes 5-10 min per tank to settle down the readings. You can buy cleaning solution and buffers to calibrate after cleaning. It is good sensor to be cleaned every 6 months to keep meter resize readings.

02-20-2013, 05:35 PM	#8
Soothing Shrimp Planted Tank Guru (View User Tanks) PTrader: (77/100%) Join Date: Nov 2011 Location: Illinois Posts: 3,534	Good to know. Thanks. __________________ DBP Club! My thinking has been invert-ed!

02-20-2013, 06:54 PM	#9
dastowers Algae Grower (View User Tanks) PTrader: (2/100%) Join Date: Feb 2011 Location: East Liverpool, OH Posts: 137	I use them on my tanks. Awesome to test multiple tanks with. __________________ The Fraternity of Dirt # 115

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