It’s a schf meter. It’s used to measure the air draw on your skimmer. I used a Dwyer one a lot when I was building skimmers 15 years ago and it’s a good tool to tune them!
It’s a schf meter. It’s used to measure the air draw on your skimmer. I used a Dwyer one a lot when I was building skimmers 15 years ago and it’s a good tool to tune them!