... and pressure relief valve testing. Main features1. 4.3" LCD display,interface is concision,operation is simple and convenient.2 ... ,Geriatric: ±1% ±1BPMMild exercise: ±1.5% ±1BPMStrenuous exercise: ±3% ±1BPM2.Pressure measurement Units: mmHg,kPa,cmH2O,inH2O,psiRange: 0 ... ±1 mmHg 301 - 400 mmHg: ±2 % of reading 3. Pressure GenerationPressure Generator, Static Pressure Range: 50 mmHg-400 mmHgDifference ...