Review on Reliable Stainless Pressure Gauge for Compressor Hydraulic Testing & Inspection by Todd Calloway

Purchased in July 2020 for use in my pool sand filter. Before Christmas I noticed the pressure was higher than usual. I thought there was something wrong with my pool system but found the gauge needle was stuck at 18psi after removing it from the filter . However when I turn on the pump it shows an increase in pressure (30psi) and it appears to be the same pressure as my sand filter which is normally 10-12psi (30-18=12).