Abstract: The present invention provides a novel partial-pressure mass spectrometer calibration device, which is mainly composed of a fine adjustment valve, a piston pressure gauge, a sample preparation chamber, a plurality of high-purity gas cylinders, a capacitive film vacuum gauge, a first-stage sample inlet chamber, a second-stage sample inlet chamber, sampling chambers, a small hole, a calibration chamber, a separation gauge and air pumping systems, wherein the sample preparation chamber is connected with the piston pressure gauge and the capacitive film vacuum gauge; the sample preparation chamber is also connected with the plurality of high-purity gas cylinders which are connected in parallel via the fine adjustment valve; a plurality of sampling chambers with different volumes are connected in parallel between the sample preparation chamber and the first-stage sample inlet chamber; a plurality of sampling chambers with different volumes are connected in parallel between the first-stage sample inlet chamber and

Abstract: The foldable push-up exercise device according to the present utility model comprises a first device body, a second device body, a connector and at least two device handles. Both the first device body and the second device body are pivotally connected to the connector and can be rotated and folded around a pivot point, and are connected and fixed by a connecting buckle provided on the first device body and the second device body after they are folded. The device handles are detachably mounted in a plurality of handle mounting holes provided on the first device body and the second device body, and can also be detachably stored in a folded assembly of the first device body and the second device body. It is convenient for packaging and storage and it is also convenient and easy to use.