What do you use to check your SG?

My refractometer seems to be broken. It's 5 to 6 years old. I can calibrate it, then use the same calibrating solution on it right away again and it's off from where I calibrated it from. I can test my tank water and it would read 1.021 (which it's not) then test the tank water again right away and it reads 1.024.

I think the time has come to get something new. So what do you fellow reefers use to check your SG.

 

Floating glass hydrometer. If it's good enough for scientific labs, then it's good enough for me.

http://www.coleparmer.com/Category/Hydrometers/2413

 

5 year old refractometer.

 

35pt calibration fluid and a refractometer.
On mine, I found that using 0tds water and setting it at 0, isn't as accurate as using the 35 and setting it at 35 (1.0265). I know the scale should be the same, but it's not on my refractometer.
I believe it's a lower quality model made by 'ATC'

 

Possibly the most used, best piece of equipment I own. I seriously don't know why I didn't buy one sooner.

 

Nice.......

 

I use the Milwaukee digital one as well. I absolutely love it. so easy to use with no guessing at levels. Just tells you what it is. Obvious a little more money

 

H2 Ocean refractometer calibrated at 35pt. There was an interesting post about getting different readings based upon the light used to look through the refractometer however I don't think this would account for your swings that seem so severe. Sounds like time for a new purchase.

 

I recently calibrated my refractometer and it would not adjust to the correct level. The set screw adjustment was goofed up. Decided to purchase a new one. I think it was just worn out from use.