I'm getting different readings from my BRS refractometer and Tropic Marin hydrometer. I used BRS Refracto Juice (Brightwell) to calibrate it at 35ppt/1.025sg. I tested some water using the refractometer that I mixed up 5 days ago and it was spot on at 35ppt. I floated my hydrometer in the same dead still brute can of salt water and it registered 1.0285 or 38ppt. There were no bubbles or crud on either device. What do others think? The salt mix was in the garage at about 65 degrees while the refractometer was calibrated in the house at 74. Any ideas who to trust? I'm leaning to trust the hydrometer.