AltonAnt wrote:I have a £5 China special from Amazon and it appears to work fine. I expect it to last only a year or two which is fine for me.
krazypara3165 wrote:AltonAnt wrote:I have a £5 China special from Amazon and it appears to work fine. I expect it to last only a year or two which is fine for me.
how accurate is it? I had one for my aquarium but found it to be way, way off.
AFewTooMany wrote:Anybody used one of these? Cheapest 0.01 resolution I could find
https://www.amazon.co.uk/dp/B00TGUM5DU/ref=cm_sw_r_awd_9dyPvbSCR5X30
AltonAnt wrote:AFewTooMany wrote:Anybody used one of these? Cheapest 0.01 resolution I could find
https://www.amazon.co.uk/dp/B00TGUM5DU/ref=cm_sw_r_awd_9dyPvbSCR5X30
I have the less accurate 0.1 resolution one of these which in the ad you posted in more expensive![]()
I have the one that came with a few packs of buffer solution.
http://www.amazon.co.uk/digital-calibra ... B004YD7W82
AFewTooMany wrote:Is it any good though? Do you have anything to compare it or the reading it gives against?
NickW wrote:As recommended by aleman to pittsy and then pittsy to myself...
http://m.rapidonline.com/Catalogue/Product/51-5153
You will need to buy buffer solutions
AltonAnt wrote:There are various things you can measure that have stable pH levels such as distilled water (obviously) and Coca-cola (pH 2.5).
Graham_W wrote:I am sure that I too followed a link supplied by Aleman, but search the web as much as I can, I cannot find a replacement electrode or the accessory temperature probe.
Albert Einstein wrote:Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.
wallybrew wrote:
The theoretical pH of distilled water is 7 but it is more likely to be closer to 5. The latter value is after it has been standing and equilibrated with its surroundings. It has no buffering power irrespective of its probable equilibrated pH and is should therefore be shown the door in respect of checking you pH meter.
CraftyTim wrote:I agree that the pH of water will change when left standing, but from my observations the pH of water will slowly rise when left standing, I guess it must be contact with O2 that causes this.
CraftyTim wrote:wallybrew wrote:
The theoretical pH of distilled water is 7 but it is more likely to be closer to 5. The latter value is after it has been standing and equilibrated with its surroundings. It has no buffering power irrespective of its probable equilibrated pH and is should therefore be shown the door in respect of checking you pH meter.
I agree that the pH of water will change when left standing, but from my observations the pH of water will slowly rise when left standing, I guess it must be contact with O2 that causes this.
AltonAnt wrote:I think it absorbs CO2 and produces carbonic acid but freshly distilled water will be pretty close to neutral.
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