The TPI 440 is a handheld electrical test device that combines a 1MHz, single-channel digital oscilloscope for viewing low-bandwidth electrical signals with a true RMS digital multimeter for measuring AC voltage to 750V, DC voltage to 1,000V, AC and DC current to 10 amp, resistance to 30MΩ, capacitance to 400μF, and frequency to 2MHz. The oscilloscope has a maximum real-time sample rate of 20MS/s and record length of 256 pixels for viewing industrial power signals such as motor controls, UPS, switching power supplies, and PLC controls. Spikes in signals can be found with the glitch capture trigger. The 4,000-count, true RMS (root mean square) multimeter provides accurate readings when measuring linear or non-linear loads, regardless of waveform. It has two ranging modes: manual, which allows the user to select the operating range, and auto, which automatically selects the appropriate operating range. The relative function allows a measurement to be set as a reference value and displays subsequent measurements as a positive or negative deviation from that value, and the record function captures maximum, minimum, and average values for parameter. A continuity buzzer confirms that the circuit conducts electricity, and a diode check detects whether a circuit’s diodes are working properly. The unit's component test checks voltage-current signatures on resistors, capacitors, and semiconductors, its logic test indicates transitions up to 2 MHz, and its frequency counter measures low-frequency signals from 1Hz to 2MHz, displaying duty cycle, pulse width, and period. Additional specifications include a sweep speed of 1μs to 1s and various triggering features. The unit has a 3" x 3" LCD with a resolution of 160 x 240 pixels that can simultaneously show a waveform and a reading, and has a backlight for visibility in low light. A multimeter is an electrical testing tool for measuring multiple properties of an electrical circuit to verify proper operation o