Abstract: A toolbox includes a main body and a lid. The main body has a base and a plurality of sidewalls. The sidewalls are disposed on and extend upwardly from the base. The sidewalls and the base together define an interior of the main body. Each of the sidewalls has an upper surface. The base has a plurality of socket holes formed therein. The socket holes are configured to receiving wrench sockets. The lid has an upper surface and a lower surface. The lid is slidably affixed to the sidewalls of the main body. The lid is selectively manually movable between a closed position, where the interior of the main body is covered, and an opened position, where the interior of the main body is uncovered. Each of the main body and the lid is formed entirely from a non-metallic material.

Abstract: A pulsed pressure sensor circuit (11) with increased sensitivity for measuring low pressures. A pulse generation circuit (12) is enabled by a microprocessor (28) to output a voltage pulse. The voltage pulse biases a pressure sensor (17) which has a port exposed to a pressure to be sensed. The pressure sensor (17) outputs a differential voltage which is proportional to the pressure at the port. The differential voltage is amplified by an amplifier (23) which has an output coupled to the microprocessor (28). A voltage divider circuit (26) is coupled to the pulse generation circuit (12) and has an output coupled to the microprocessor (28). The microprocessor (28) samples the voltages at the output of the amplifier (23) and the output of the voltage divider circuit (26). Microprocessor (28) then calculates the pressure using the sampled voltages and data stored in memory.