really sorry to be hearing your loss, again..I would certainly go for a refractometer, and i nade the switch to th digital type thermometer as they are foar more accurate....
Niko
Which digital thermometers do you use? I've tried out the Coralife ones at the local stores and they just seem to be crap. I have one thats 2 degrees. My other one is right on with the two glass ones.