Abstract: A digital pressure gauge is configured for coupling with an external fluid pipe, and includes a housing, a pressure sensing unit, a battery seat and a cover. The housing includes an inlet for coupling with the external fluid pipe to permit flow of fluid from the external fluid pipe into the housing. The pressure sensing unit is operable to sense fluid pressure of the fluid flowing through the inlet. The battery seat is disposed in the housing for receiving a battery. The housing is formed with an opening registered with the battery seat to permit placement of the battery in and removal of the battery from the battery seat through the opening. The cover is removably attached to the housing.

Abstract: A magnetic sensor includes a casing body having opposite first and second ends, a receiving notch proximate to the second end, and a through hole communicating with the receiving notch. A positioning unit includes a bushing disposed in the receiving notch and having a protrusion, and an adjustment member having a rotary portion retained rotatably in the through hole, and a head portion fixed to the tubular portion. The bushing is rotatable relative to the casing body between protruded and retracted positions, where the protrusion is protruded out of and retracted into the receiving notch so that the bushing interlocks and uninterlocks with blocking portions of a pressure cylinder, respectively. A sensing module is disposed in the casing body in proximity to the first end.

Abstract: A digital pressure gauge is configured for coupling with an external fluid pipe, and includes a housing, a pressure sensing unit, a battery seat and a cover. The housing includes an inlet for coupling with the external fluid pipe to permit flow of fluid from the external fluid pipe into the housing. The pressure sensing unit is operable to sense fluid pressure of the fluid flowing through the inlet. The battery seat is disposed in the housing for receiving a battery. The housing is formed with an opening registered with the battery seat to permit placement of the battery in and removal of the battery from the battery seat through the opening. The cover is removably attached to the housing.

Abstract: An electrical component has a housing received in a receiving groove, which is confined by opposite lateral walls connected to a groove bottom, formed in a support. A retaining device includes a base extending from one end of the housing and disposed on the groove bottom of the receiving groove, an engaging block confined non-rotatably in the receiving groove and disposed between the base and opposite stop protrusions that are formed respectively on the lateral walls and that cooperate to form a restricted access into the receiving groove, and a fastener extending rotatably through a through hole in the engaging block and coupled rotatably to the base. Operation of the fastener can drive the engaging block to move to an engaging position, where the engaging block abuts against the stop protrusions and where the fastener urges the base toward the groove bottom.