HOME > EXTECH > MULTIMETERS > EX540 extech logo

Extech EX540
Digital Multimeter and Datalogger with Wireless PC Connection
12 Function, True RMS, 914MHz

Click here for a larger image - Extech EX540 12 Function True RMS Industrial MultiMeter with IR ThermometerClick for larger image - Extech EX540
Extech EX540 Shown
The Extech EX540 is the Winner of EC&M 2010 Product of The Year Award
Product Information
Datasheet 362 KBPDF
Manual 672 KBPDF
EX540 Demo Movie
EX540 Movie
pdf helpPDF Help
  • True RMS measurements for accurate AC Voltage and Current measurements
  • AC/DC Voltage & Current, Resistance, Capacitance, Frequency (electrical/electronic), Temperature, Duty Cycle, Diode/Continuity
  • Double molded for waterproof (IP67) protection, CAT IV-600V safety rating for industrial applications
  • Data Acquisition Mode for real time data transmission directly to your PC
  • 1000V input protection on all functions
  • Dual sensitivity frequency functions
  • Large triple LCD display
  • Complete with double molded test leads, magnetic hanging strap, Type K probe, remote receiver with USB cable, PC software, carrying case, and 9V battery
  • EX540 wireless frequency (914MHz) is suitable for use in US, Canada, Mexico, and select other countries. Please see the Extech EX542 (433MHz) for most other regions.

The Extech EX540 MultiMeter/Datalogger with Wireless PC Interface meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency (electrical & electronic), Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature. With it's CAT IV, Datalogging, and Wireless features, the Extech EX-540 CAT IV True RMS MultiMeter datalogs up to 9,999 readings with wireless USB interface capability to transmit readings to your PC in real time. The Extech EX540 can store and recall data, and features a waterproof, rugged design for heavy duty use. This meter can transmit data wirelessly when linked to a PC. Proper use and care of this meter will provide many years of reliable service.

The innovative Extech EX540 meter offers wireless connectivity to your laptop or PC using a USB receiver with a range comparable to Bluetooth (10m/33 ft). The Extech EX-540 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, with the Extech EX 540, 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 Extech EX-540 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 EX540 Digital Multimeter and Datalogger with Wireless PC Connection 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 Extech EX540 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.

Display Counts 40,000 count
Averaging/True RMS True RMS
Basic Accuracy 0.06%
DC/AC Voltage 0.01mV to 1000VDC;
0.01mV to 1000VAC
DC/AC Current 0.01μA to 20A
Resistance 0.01Ωto 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)
Temperature (Type K) -22 to 575°F (-30 to 300°C)
Duty Cycle 0.01 to 99.99%
Diode/Continuity Yes
Dimensions 7.25 x 3.25 x 2.25"
(184 x 83 x 57mm)
Weight 12.3oz (349g)
Ordering Information
Model Description Buy Online Price
EX540 Extech EX540 12 Function True RMS Industrial MultiMeter/Datalogger 914MHz Buy Now $299.99
EX540-NIST Extech EX540-NIST 12 Function True RMS Industrial MultiMeter/Datalogger with NIST Calibration Certificate Buy Now $374.99
Included Accessories
  • 1 - Double-molded Test Leads
  • 1 - TP873 - Type K Bead Wire Temperature Probe (212ºF/100ºC)
  • 1 - Magnetic hanging strap
  • 1 - PC software
  • 1 - USB Wireless Receiver
  • 1 - Carrying case
  • 1 - 9V battery
Optional Accessories
TL810 Extech TL810 Electrical Test Lead Kit 8-piece Double Insulated Kit Ideal for Electrical Applications Buy Now Sale $36.49
(Reg. $49.99)
TP200 Extech TP200 Type K Pipe Clamp Temperature Probe Buy Now Sale $36.07
(Reg. $40.99)

*NOTE: Items ordered with optional NIST calibration will require
approximately 10 days to complete the certification.