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Multimeters
(Multi Meter, Digital Multimeter, Digital Volt Meter, DMM, DVM)

Multimeters or Digital Multimeters are electronic measurement instruments that combine multiple measurement functions that include but are not limited to voltage, current and resistance. Some Multimeter models will also include frequency and temperature measurement, along with capacitance and diode testing. Multimeters may also be known as Digital Multimeters, Multi Meters, DMM, DVM. Several Multimeter models are available with Data Logging functions built in. RDI is proud to offer Professional True RMS Multimeters from both TPI and Extech Instruments.
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Extech EX500 Series MultiMeter Extech EX500 Series Heavy Duty Industrial MultiMeters

Waterproof Rugged Design with CAT IV-600V safety rating for industrial applications

EX470 True RMS Autoranging Multimeter with IR Thermometer Extech EX470A True RMS Autoranging Multimeter with IR Thermometer

Combination Autoranging multimeter with IR Thermometer

Our Price: $157.99
EX450 Autoranging Multimeter with IR Thermometer Extech EX450 Autoranging Multimeter with IR Thermometer

Combination Autoranging multimeter with IR Thermometer

Our Price: $119.99
EXT-MM560A MultiMaster Extech MM560A - MultiMaster High-Accuracy Multimeter

True RMS Multimeter with 50,000/500,000 count LCD
  • Full range multimeter functions with 0.03% basic DCV accuracy and up to 20kHz True RMS ACV bandwidth
  • 50,000 count (500,000 for DCV and Hz) backlit LCD display with bar graph

Our Price: $259.99
EX430 True RMS Autoranging Multimeter Extech EX430 True RMS Autoranging Multimeter

Economical True RMS Multimeter With 11 Functions

  • True RMS AC measurements
  • Relative function
  • Type K thermometer, Capacitance, Frequency, and Duty Cycle
  • Low current capability - measure down to 0.1uA
  • Audible and visual input alerts
  • Easy to read 1 inch digits on backlit display
  • Max Hold for AC/DC Voltage and Current measurements and Relative function for establishing a base line for reference
  • Complete with CAT III test leads, multi-position tilt stand and velcro strip for hanging, protective holster with test lead holder, bead wire temperature probe (-58 to 482 Deg. F/-50 to 250 Deg. C) and 9V battery

Our Price: $94.99
TPI-126 Compact autoranging Digital Multimeter TPI-126 Compact autoranging Digital Multimeter

Compact autoranging DMM with 0.3% DCV basic accuracy and 400mA AC/DC range

  • 4,000 count display
  • 0.3% DCV basic accuracy
  • 0 to 600 volts AC/DC; max resolution 0.1V
  • 0 to 40MΩ resistance; max resolution 0.1Ω
  • Audible continuity
  • 0 to 400 mA amps AC/DC; max resolution 0.01mA
  • Autoranging
  • Min/Max
  • Data Hold
  • Sleep mode/auto off
  • cULus 61010-1
  • CAT II - 1000V, CAT III - 600V
  • 3 Year Limited Warranty

Our Price: $59.95
MM570 MultiMaster High Accuracy True RMS Multimeter with Thermocouple Input Extech MM570 MultiMaster High Accuracy True RMS Multimeter with Thermocouple Input

MultiMaster® 50,000/500,000 Count, High-Accuracy, Wide-Bandwidth True RMS Multimeters

  • 0.02% basic DCV accuracy
  • 50,000 count display with 500,000 counts for DCV and Hz
  • True RMS combination AC+DC function
  • Highest resolution to 1µV, 0.01µA, 0.0001Hz, 0.01°
  • Dual input Type K Thermometer
  • Higher True RMS ACV bandwidth (up to 100kHz)
  • 1,000V input protection on all functions
  • 4 to 20mA, displayed as 0-100% for process current measurements

Our Price: $309.99
MP510 MultiPro Professional Multimeter Extech MP510 MultiPro Professional Multimeter

MultiPro® High Performance Multimeters with RS-232 PC Interface

  • 0.08% basic DCV accuracy
  • Smart auto power off
  • Hold and low resistance auto lead zero
  • Optional SW800 PC software and cable sold separately

Our Price: $149.99
MP530 MultiPro True RMS Professional Multimeter with Temperature Probe Extech MP530 MultiPro True RMS Professional Multimeter with Temperature Probe

MultiPro? High performance, True RMS Multimeters with RS-232 PC Interface

  • 0.08% basic DCV accuracy
  • True RMS AC Voltage & Current
  • Temperature functions
  • Relative, Min, Max, Max-Min, Peak Hold and Zoom
  • Smart auto power off
  • Hold and low resistance auto lead zero
  • Optional SW800 PC software and cable sold separately

Our Price: $189.99