I'm in need of some assistance, is any one willing to let me test my new refractometer, that I just calibrated, on their tank water, so I can make sure I did it right. This is my 1st time using one & I want to get it right. I reside in Brooklyn & am willing to travel. I would really appreciate it if someone would assist me with this since I want to get my 1st saltwater aquarium running this weekend. Thanks.