The HS728M Hydraulic High Pressure Comparison Pump is a laboratory instrument that generates pressure up to 1000 bar for calibrating high-pressure instruments against a standard gauge. It features a hand pump for quick system pressurization and a booster pump for calibrating high-pressure points. The shut-off valve is closed during pre-pressurization to 250 bar to achieve high-pressure ranges. The lead screw allows for precise adjustment of the pressure values. A specially designed transparent oil cup shows the level of the working medium. The HS728M is widely used to calibrate pressure gauges in laboratories.