REED R5040 1000A AC/DC Clamp Meter with Temperature and Non-Contact Voltage Detector, True RMS


This autoranging True RMS clamp meter is capable of measuring AC/DC current and voltage, resistance, frequency, capacitance, duty cycle and temperature. Featuring a 50,000 count backlit LCD display with a 61-segment analog bargraph and double molded plastic housing, the R5040 keeps track of min/max readings and includes a non-contact voltage detector built into the clamp tip.


  • Measures AC/DC current/voltage, resistance, capacitance, frequency, duty cycle and temperature
  • 50000-count backlit LCD display and analog bargraph
  • Low battery and overrange indicators
  • Built-in non-contact voltage detector with LED indicator
  • True RMS AC measurements
  • Min/Max, display hold and relative mode
  • Diode test and continuity check functions
  • Durable double molded plastic housing
  • Cat. III 600V safety rating


AC/DC Current
Range500, 1000A
AccuracyAC: ±(2.8% rdg. +30 dgt.)
DC: ±(2.5% rdg. +30 dgt.)
Resolution0.01, 0.1, 1A
AC/DC Voltage
RangeAC: 500mV, 5, 50, 500, 750V
DC: 500mV, 5, 50, 500, 1000V
AccuracyAC: ±(1.0% rdg. +30 dgt.)
DC: ±(0.1% rdg. +4 dgt.)
ResolutionAC/DC: 0.1mV, 0.001, 0.01, 0.1, 1V
Range500Ω, 5, 50, 500kΩ, 5, 50MΩ
Accuracy±(1.0% rdg. +4 dgt.)
0.1Ω, 0.001, 0.01, 0.1kΩ, 0.001, 0.01MΩ
Range500, 5000nF, 50, 500µF, 5mF
Accuracy±(3.5% rdg. +10 dgt.)
Resolution0.01, 0.1nF, 0.01, 0.1μF, 0.1mF
Accuracy±(0.3% rdg. +2 dgt.)
Range-148 to 1832°F (-100 to 1000°C)
Accuracy±(1.0% rdg. + 4.5°F)
±(1.0% rdg. + 2.5°C)
Resolution1°F, 1°C
General Specifications
Range SelectionAutoranging / Manual
True RMSYes
Display50,000 count LCD display
Display HoldYes
Relative ModeYes
Diode TestYes
Backlit DisplayYes
Analog BargraphYes (61-segment)
Continuity CheckAudible signal if resistance <35Ω
Duty CycleYes
Non-Contact Voltage DetectorYes
Autoshut offYes (after 15 mins)
Power Supply9V Battery
Low Battery IndicatorYes
Jaw Opening1.5" (40mm), up to 500 MCM
Overvoltage CategoryCAT. III 600V 
Product CertificationsCE
Operating Temperature32 to 122°F (0 to 50°C)
Storage Temperature-4 to 140°F (-20 to 60°C)
Dimensions9.1 x 3.0 x 1.5" (232 x 77 x 39 mm)
Weight9.6oz (271g)