The Triplett 9305 Compact Digital Clamp Meter is an average-sensing, manual- and auto-ranging multimeter for measuring current, voltage, capacitance, frequency, resistance, and temperature in electrical testing applications. It has a clamp that measures AC to 400 amp. The clamp has two jaws that can close around an electrical conductor up to 30mm (1.2 inches) in diameter to measure current without touching or interrupting the circuit. A set of test leads is included for measuring AC and DC voltage to 600V, capacitance to 100μF, frequency to 10 kHz, and resistance to 40MΩ. The meter comes with a K-type thermocouple probe for measuring temperatures from –20 to +760 degrees C (– 4 to +1,400 degrees F). The meter has a rotary switch to select the property to measure, and a 4,000-count LCD with a backlight for visibility in low light. Its non-contact voltage detector senses AC voltage without making contact with the circuit, lighting an indicator when AC voltage is present. The data hold function freezes a reading on the display after disconnecting from the circuit. A continuity buzzer confirms that the circuit conducts electricity, and a diode check detects whether a circuit"s diodes are working properly. The unit operates on two AAA batteries, and turns off automatically after 30 minutes of non-use to conserve battery life. It has a low-battery indicator that signals when the batteries need to be replaced. Clamp-meters are commonly used in HVAC, industrial, and residential applications. This average-sensing, also called average-responding or mean value, meter provides accurate readings when measuring linear loads, such as standard induction motors and incandescent lights, where the current or voltage has a sinusoidal 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. Accuracy and resolution specifications vary according to the range being measured. The meter has overload protection to CAT III, 600V, which covers equipment in fixed installations, such as switches in the fixed installation and some industrial equipment that is permanently connected to the fixed installation. It comes with a set of test leads, a temperature probe, two AA batteries, and an instructions.SpecificationsMaximum AC input400 ampMaximum AC voltage input600VMaximum DC voltage input600VMaximum capacitance detected100μFMaximum frequency detected10 kHzMaximum resistance detected40MΩTemperature range detected– 20 to +760 degrees C/– 4 to +1,400 degrees FOverload protectionCAT III, 600VStandards metCE (European Conformity) markingPower source(2) AAA batteries (included)Weight0.5 lb.Dimensions8 x 2.25 x 1.25 inches (H x W x D) H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.Clamp meters, also called clamp-on meters, have two jaws that fit around a conductor to measure electrical current without cutting through wires, or touching or interrupting the electrical circuit. Available in handheld or benchtop models, clamp meters diagnose problems in electrical equipment, wiring, and power supplies. All clamp meters test for current. Some come with test leads and inputs for measuring voltage, capacitance, and resistance. They display information either in analog or digital form. Factors that influence meter choice include the electrical properties to be measured, the anticipated range of results, and the desired level of protection against transient voltage. Safety ratings are based on International Electrotechnical Commission (IEC) standards for low-voltage test equipment. IEC 61010 delineates four overvoltage installation categories. In general, a meter with a category IV rating will provide more protection against transient voltages than a meter with a lower category rating. Triplett manufactures test equipment for electricians, home security installers, and telecommunications technicians. The company, founded in 1904, is headquartered in Manchester, NH.What"s in the Box?Triplett 9305 Compact Digital Clamp MeterSet of test leadsK-type thermocouple temperature probe(2) AAA batteriesInstructions