Oh yeah I picked up the Hydrometers for redundancy lol. I'm still trying to decide between the Milwaukee refractometer, and the hanna salinity checker (the hand held one). I was dead set in the Milwaukee till I seen on some YouTube videos that it doesn't monitor temperature accurately. From what I've seen this hasn't been an issue towards monitoring salinity, but seems troubling (especially with the extra cost). I'm leaning more towards the hanna salinity checker now, any experience with either of these?