Standard or lab grade?

[tmgrash]

I cant seem to locate the difference between the standard grade ph probe and the lab grade one, othef than about $20. Both say they are accurate to within .01. Ordering an apex real soon, can anyone tell me the difference?

Thanks.

 

[bruce 1]

I would like to know also.

 

[Deleted member 143833]

See the duplicate thread of the same name...