Based on this product's specifications, here are some alternatives and similar models
Pressure Gauge Manometer for Aitracks and Paddleboards, Master MAS-B857, Bravo Valves
Summary description:
Mechanical pressure gauge (manometer) by Master, model MAS-B857, designed for measuring inflation pressure on Aitracks and paddleboards with Bravo-type valves. Provides direct pressure readout for accurate board inflation and maintenance. Suited for use during setup, pump checks and routine pressure monitoring to ensure safe and optimal buoyancy and performance.