probably common knowledge, but anyways..

[ashhhh]

might just be my luck with them,
but those little glass thermometers jeez- do yourself a favour and chuck em
i have had three digital ones for a while now on different tanks and decided to do a test on my display tank and the results were as follows

1st digi thermometer     27.5c
2nd digi thermometer    27.4c
3rd digi thermometer     27.5c
1st glass thermometer   32c
2nd glass thermometer  22c
3rd glass thermometer   28c
4th glass thermometer   18c

quite a difference

[davez104]

What brand of digital thermometer do you have? I bought two of the Resun ones and there is about 1.5C difference between the two.
Dave.

[Cory Fan]

Hi,

Is the digital one u mentioned a digital pen type or the stick on type???

Cheers :wink:

[ashhhh]

yep they are the stick on type with a sensor on the end of a wire that goes in the tank and the monitor sticks to the front of the tank.

not sure on the brand (asian I think) but I got them from aquariums alive in nerang for $15 each, good value imo

[madbob101]

Did you have your glasses on when u read them :lol:  I found the long yellow ones are more accurate that the short clear ones :wink:

[Savage_roo]

K I have 1 or those yellow 1's
Its for use in a lab
So It better be good it cost me $80
Its accrat to .01 c Ha ha

[aquariumwarehouse]

sorry $3.95  at aquarium warehouse

regards kev

[ashhhh]

[quote:2bcdb9ae69]Did you have your glasses on when u read them  I found the long yellow ones are more accurate that the short clear ones [/quote:2bcdb9ae69]

my eyes are fine dave 8O  8)  the ones I were referring to were the small clear glass thermometers....

[quote:2bcdb9ae69]sorry $3.95 at aquarium warehouse

regards kev[/quote:2bcdb9ae69]

I take it you mean digital thermometers @ $3.95 each??

[Savage_roo]

Ok the 1 i have goes up to 250c and is filled with mercury and is a foot long
Its not realy made for a tank but for lab use

[Cichlidkeeper]

Like everything you get what you pay for. I have an infra red laser gun to measure my temp with a range of -50  -  400 degrees which set me back over $200. I have tried most of the other ones out there and the most accurate and cheapest are those stick on strips. Anything digital and cheap is generally dodgy in my experience. I have been told ben from AOA has a very accurate model at a good price but haven't tested

[rowley89]

I bought a digital one from Ben at AOA and so far so good.

Seems to be accurate.

[ashhhh]

[quote:7d7b5335ee]Like everything you get what you pay for.[/quote:7d7b5335ee].......true that

the three that I have work fine and since I tested them all in the same tank and the results were allmost identical so Ima happy. I allso tested with a refrigeration mechanics digital thermometer and it was spot on with the 3 el cheapo ones :wink:

[Davies da fishman]

have any of you guys thought of the fact that a mercury thermometer cannot be wrong unless it is broken??? this is because a change in temperature causes a change in the space occupied by the mercury. therefore the only way in which it can be wrong is if some mug comes along and breaks it, or the company that made the thermometer has goofed up on the labelling. the [b:c3e6b7c31f][u:c3e6b7c31f]mercury[/u:c3e6b7c31f][/b:c3e6b7c31f] never lies.......
digital thermometers however are exactly that, digital, and rely on a battery to keep them accurate. seriously, wat do you think is more accurate, something natural or a battery operated machine???

[Konigwolf 13]

While its a nice test you did you missed some major points, to be correct it would have to either a:all done within the tank and all reading device within the same small area or b: all tanks exactly set up the same, I'd be interested in the results of method A, method b does not allow for eqipment variation or faults, depending on the results of that is wether I'd replace my equipment. Sorry to be anal about it it just your point v's Davies da fishman point I suppose, see who is really right
 
Andrew

[Dyce]

and how long were the glass thermometers left in the tank before reading?