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Yes, there is a calibration screw that you turn to calibrate it. It comes with calibration fluid that is 30ppt.

No hard feelings at all. Wish you told me, I would have sold you my refractometer. Skipm, I believe you have to purchase either in degrees C or Degrees F. The ones I have are in degrees F, how about yours?

NO this is not a "knock-off". JBJ does not manufacture the Digi-Lab specific gravity meter. They purchase them from the same manufacturer that makes this one and just put their name on it. You know they say you should never assume...

I have a few of these left over from our reef club group buy. Works very well. Measurement is instant. When you remove it from the water it instantly returns to absolute 0. Doesn't jump around like a Ph Meter. Specifics: 3 in 1 Thermometer 0~100 degrees F Specific Gravity 1.000~1.032...

Alright, maybe we'll set up a day we could meet half way or something. Ofcourse your always welcome to come all the way up here. I work a lot (DHS) and any time I get is spent with my family so its hard for me to get away. I'll send you some pics when I get a chance of some of the corals I have.

I'm up here on the Canadian border near St. Albans. I saw a post of yours and thought we might be able to trade frags until I saw where ticonderoga NY was. :shock:

Still have some available. I accept paypal and have a verified premier account with 50+ sales no negative. Will also provide my ebay username which has 120+sales w/100% positive feedback. I realize i'm new to this forum

:) Hey thanks. I'm getting old:(

Sure, here is a pic out of the package. There is also another suction cup for the back of the therm to put it on the ouside of a tank. Thanks.

I needed 8 of these for my reef and cichlid tanks but it was cheaper for me to buy 20 of them than it was to buy 8. So I have 12 left over that I need to get rid of. They are small in size: 2.5" by 1.5" Measure in degrees F and C Has an in tank probe w/suction cup. Battery is included...