1. Model: GM510 2. With11unitsto select:bar,mbar,kPa,kgf/cm2,mmHg,cmH2O,Ozf/in2,psi,inHg,inH2O,ftH2O. 3. USB dara hold. 4. USB interface 5. Low battery indicator function 6. Auto power off. 7. A computer through a USB adapter,can be used to record special software for data analysisSpecification: Package Weight One Package Weight 0.45kgs / 0.99lb One Package Size 21.3cm * 18.5cm * 4.3cm / 8.39inch * 7.28inch * 1.69inch Qty per Carton 40 Carton Weight 21.00kgs / 46.30lb Carton Size 45cm * 22cm * 20cm / 17.72inch * 8.66inch * 7.87inch Loading Container 20GP: 1346 cartons * 40 pcs = 53840 pcs 40HQ: 3126 cartons * 40 pcs = 125040 pcs