For BetaGauge II, BetaGauge 321A/311A/301, MC1200, MC1000, 3001, and MasterCAL 990 Only Gauge, vacuum, absolute, compound and differential measurements from inches H2O to 10,000 psi Accuracy specified over 15°C to 35°C range Isolated and non-isolated measurements, range dependant .025% full scale accuracy