PH test pen recommendation

swackett

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Joined
29 May 2008
Messages
439
Location
Epsom, Surrey
Hi,

I've seen various PH test pens on Amazon ranging in price from £12 to £120, can anyone recommend/tested any of these pens. Ideally looking get one of the cheaper ones to help me get my PH to 6.8.

Ta

:)
 

zozo

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Joined
16 Apr 2015
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7,308
Location
Netherlands
I used several over the years, noticed the cheapers ones usualy have a rather slow reaction time and or susceptible to electrical interfearance. So putting them in the water, i takes 5 minutes for the reading to stabelize, gets boring after a while waiting that long. If it keeps fluctuating it like is the pump in the tank, or even the light cables and even maybe your cellphone interfearing with the reading.

The glass ball sensor has a fluid, over time this fluid can change in consistancy or even dry completely out if stored wrong. There are pens around which can be refilled.
The ones that can't, if reading is off and can't be calibrated anylonger the fluid is compromised and are ready for the trashbin. SO for the long term, a refillable one is longer lasting. :)
 

Cactusface

Member
Joined
5 Sep 2017
Messages
69
Location
Leicester. UK
Hi,
I have 2 cheap PH pen type meters, they seem fine with new batteries and calibrated, but seem to lose it, as the batteries go down, which really means you need 2 big pots of calibration solution, and recalibration too often. The TDS meter also shown seems fine, indicating 0-1 with my RO water, but I can't prove that's correct either. Another case of buying cheap and Chinese, a couple of weeks ago I noticed that one of my tanks had droped from 25c to 19c, Alarm bells started, failed heater, check it, OK! put the therometer in another tank and it's showing about 6-7Deg lower, new battery problem solved.

I can buy a PH probe from China! but the actual instrument in not easy to build, even for a NUT like me, and I'd still have to calibrate it, etc. These's this one on eBay that don't look too bad: http://www.ebay.co.uk/itm/Digital-p...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649

Hope it helps, regards.

Mel.

PHmeter-1.jpg PHmeter-2.jpg Thermo-1.jpg
 

Zeus.

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Joined
1 Oct 2016
Messages
3,125
Location
Yorkshire,UK
Hi
Have pH controler and pen. pH pen cost about £20 off Amazon, great buy IMO. Has claimed accuracy of O.01pH !!!
But very handy for setting up BBS rates and PH drops, I don't get in the actual pH value as they all calibrated slightly differently and give slightly different readings, but it is on a log scale pH so no surprise really.
PH controler handy as can move it around tank easy on long cable and do easy spot checks that same pH drop in many different areas of tank.

Zeus
 

Nelson

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Joined
17 Nov 2008
Messages
2,551
Location
Norfolk
Be careful with some cheap Chinese ones.
They give you a screw driver etc,to calibrate it,but the hole is empty in the unit.
 

zozo

Member
Joined
16 Apr 2015
Messages
7,308
Location
Netherlands
Milwaukee are solid ones. I prefer the ones with a separate probe.
And don't fall for the horror probe stories, spending +$60 on a yearly replacement.. :) I've been using a Milwaukee SMS122 for over 2,5 years now with this probe.
https://www.banggood.com/PH-Electro...ntrol-Meter-Sensor-p-912723.html?rmmds=search
Ordered 2 in case, still working with the same one all this time.. Works like a treat and didn't even need a refill..

Tho must note: The Milwaukee doesn't have a ground pin, well it must have but it'sbuild in and very low current, this makes it very susceptible to electrical interfearance... I had to place it inline away from any electrical source to eliminate any disturbance.. Because it's an SMS with a build in Relai, disturbane cause the relai to shake ratle and roll like mad..

The Hanna equiptment also is very high end, some come with a seperate Ground pin to eliminate this, can't be disturbed, but have a relative high working voltage and current between pin and probe for that, it's measurable in the tank water with a multimeter between 1,5 and 3 volts and even can feel the current flow in you ground yourself en stick a finger in the water. If you can feel a tickling sensation try to imagine what the fish feel swimming near it.. In the long term i doubt it is heathy for them, these high current grounded devices are not realy designed for aquarium use, this is in my opinion horticulture stuff only. Physicaly grounding an aquarium is a questionable practise anyway, any small electrical leak will start flowing affecting fish with sensation. So actualy using any type of permanent electronic measuring device in an aquarium it means the tank is permanently grounded to the electrical grid, simply because without any grund the device wont work. Than with using this type of device it is adviceabe to regularly check for power leakages with a multimeter between tank water and ground.. If the tank isn't grounded electricity can't flow and can't cause sensation. But again such a device grounds the water permanently than it becommes rather important. This is something you can't see with your eyes, nor maybe feel, but your fish might and not realy like it. It just shouldn't be there.. :thumbup:
 
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