first saltwater aquarium, weird 15g setup, many questions

[Reefing102]

It’s the one I use. I keep one near each heater in my tank (I have two heaters in my tank) and set the temp alarm to be just a couple degrees above my heater setting. Haven’t had an issue with it.

 

[griss]

ohh i misread it. it does have a 0ppt mark, on the side marked with this symbol -> ‰

(we're using ppt to mean parts per thousand, right? when i look up anything ppt it gives me parts per trillion)

the side that starts at 1 marked with d 20/20 is specific gravity, and distilled water should be at 1. in the manual they have a diagram where both sides start at 0, so i was confused.

My bad, I typed parts per million, should he ppt or parts per thousand or salinity. Should be 0 with distilled or RODI water to calibrate.