refractometer help!

[flutterpower]

Hi have had a reef tank for 12 months and it's been great but a few days ago everything died within an hour. The guy at my local fish shop told me to buy a refractometer which i have but it is measuring in % How do I concert this to SG please?

 

[RA]

I've never seen a refractometer give a percentage reading. It should have a scale on the left hand side that gives you a reading. Your salinity should be around 1.025.

 

[Mark9]

And on the right it should have the PPT, aim for close to 35 if you have corals.
PPT is parts/thousand, 35 is 3.5%.

 

[flutterpower]

This only has percentage! And it's reading 4.2%

 

[flutterpower]

Thanks mark9 so I need to get it down to 3.3%?

 

[MMacro]

Is it in brix?

 

[disc1]

You need to check that refrac against a known 35ppt standard in this case. Since it is measuring probably brix, the reading won't be quite right for salinity. Check with a good standard and set that to read at whatever line or number you choose. Then make your saltwater to match that.

 

[Mark9]

Did you buy the correct refractometer?
There are many different types.
just which did you get?

 

[flutterpower]

http://www.amazon.co.uk/RHS-28ATC-0-28-Salinity-Refractometer-Aquarium/dp/B00F27P3E4/ref=pd_sxp_f_pt