markcasto
New member
I was using a swing arm hydrometer made by coralife it would give me a reading of say 1.020 but with the deltic I got 1.015 so the deltic is much better and far easyer to read as well just add 3 drops and look at the scale for a spot on reading. In fact if I had done hypo with the coralife I would have gone way to low. I have two of them and a glass one they are both out compared to the deltic refractometer heres a link to the deltic
http://www.shop-coralgarden.co.uk/product_info.php?products_id=365
http://www.shop-coralgarden.co.uk/product_info.php?products_id=365