Product features: Stainless steel excellent wear and corrosion resistance, the iquid-filled pressure gauges are designed for extended service life and stable performance. Liquid filling reduces bubbles and vibrations in the gauge, resulting in a more stable and clear scale reading. The precise sealing design prevents liquid leakage and maintains the accuracy of the gauge Product specifications: Product Name: Stainless Steel Liquid Filled Pressure Gauge Size: 2.5" dial size, 1/4" NPT Back Mount Pressure Range: -30-30PSI dual scale Temperature Range: 32-131℉ (0-55℃) Accuracy: +/-3-2-3% Application Scenarios: for Tube, Water Pump, Gas, Liquid, oil, Pressure Test . Packaging content: 1 x -30-30PSI Stainless Steel Liquid Filled Pressure Gauge 1 x PTFE tape