Industry-First Wireless Datalogging Multimeter


The Extech EX540 digital multimeter is the first handheld multimeter to offer wireless data streaming to a laptop or PC for datalogging or real-time monitoring. The new DMM is part of the EX500 series of industrial multimeters, considered the “toughbook” of multimeters.
Extech’s ruggedized, waterproof design can withstand a 6-foot drop, making it the ideal starting point for a go-anywhere DMM.

The innovative new meter offers wireless connectivity to your laptop or PC using a USB receiver with a range comparable to Bluetooth™ (10m/33 ft). The EX540 transmits real-time data for monitoring, trending and analysis (using the included software) on one of two available frequencies (433 and 914 MHz).

Now, electrical professionals can monitor and datalog readings at a safe distance from hazardous locations. Additionally, it is easier to perform remote tasks such as powering up a device from a control panel that is not nearby. From a time-saving perspective for laptop users, the EX540 permits a user to set up his or her laptop at a centralized location and then sequentially datalog readings throughout a site without relocating the laptop.

Ruggedized to industrial-duty specs, the new Extech is a True RMS DMM that, in addition to wireless datalogging, can log up to 9,999 readings internally and also reads voltage, current, resistance, capacitance, frequency (with dual-range sensitivity for electrical and electronic work), duty cycle (dwell), continuity, diode testing (2.8V), and even temperature (using its Type K thermistor bead probe).

The new meter features accuracy that is a tough-to-beat 0.06% and it is backed by a Category IV overvoltage safety rating, protecting users even on outdoor wiring.

Several one-button statistical data functions include minimum/maximum, relative, hold, and peak hold as well as selectable auto-ranging or manual-ranging. An analog-style bargraph complements the EX540’s informative triple-reading display.

The Extech EX540 includes double-molded test leads, USB wireless receiver, temperature probe, magnetic hanging strap, 9V battery and carrying case.


• Display Counts 40,000 count • Basic Accuracy 0.06% • DC/AC Voltage 0.01mV to 1000VDC; 0.01mV to 1000VAC • DC/AC Current 0.01μA to 20A • Resistance 0.01Ω to 40MΩ • Capacitance 0.001nF to 40mF • Frequency (electrical) 40Hz to 400Hz • Frequency (electronic) 0.001Hz to 100MHz • Temperature -50 to 1382°F (-45 to 750°C) • Duty Cycle 0.1 to 99.90% • Diode (2.8V)/Continuity Yes • CE approvedYes • Dimensions 7.25x3.25x2.25"(184x83x57mm) • Weight 12.3oz (349g)
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