Looking for a highly sensitive hall sensor

[gjoo]

I'm building a gaussmeter and I'm looking for a very sensitive ratiometric hall sensor. I need it to measure dc fields up to about 800 gauss , but I want as good of a resolution as possible, maybe .01 gauss. I'm not the most educated on sensors , so when I read the schematics on each one, I cannot figure out if they are sensitive enough. The only info most give on sensitivity is how many millivolts/ gauss.
If anyone can recommend a hall ratiometric sensor that fills these specs, I would appreciate it greatly.

 

[kellys_eye]

I don't know of a specific device to fill your needs but I use the following site to make searches for devices based
on whatever parametric I require:

http://category.alldatasheet.com/index.jsp?sSearchword=HALL EFFECT SENSOR

You will, of course, have to sift through the results.

 

[73's de Edd]

Degree of product familiarity. . . .Hall sensors

I want as good of a resolution as possible, maybe .01 gauss.

That would be akin to me weighing myself and then stepping up again with a turkey feather in hand and expecting a frational readout increment .

 

[kellys_eye]

The Earth's magnetic field varies from 0.25 to 0.65 gauss. You're also going to need some real good shielding.....