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General Tools CM660 Dual Display Amp Clamp 750V

General Tools CM660
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General Tools, CM660 New Dual Display 600 A Clamp 16 Functions, 49 Ranges


  • 16 functions, 49 ranges (CM660/CM700); 17 functions, 51 ranges (CM770)
  • Measures temperature from -58° to 1112°F (-50° to 600°C) using included  K-type stem thermocouple
  • Also measures surface temperature from -4° to 662°F (-20° to 350°C) using 6:1 D:S detachable IR thermometer with fixed emissivity and measurement hold button (CM770 only). When IRT is re-attached, its reading is optically coupled onto meter's display.
  • Uses beeper to verify integrity of diodes and check circuits for continuity
  • 0 to 200µA/2000µA AC/DC ranges for measuring flame rod current with 0.1µA/1µAresolution using included test leads
  • Built-in Non-Contact Voltage (NCV) detector with 4 sensitivity settings & audible and visual alerts
  • Large backlit digital LCD with two 6000-count readouts for simultaneous display of real-time current or voltage on primary readout and line frequency on secondary readout
  • Fast-response analog bar graph
  • Bright LED work light
  • Auto and Manual ranging and MIN/MAX options
  • Data HOLD and REL (zero) buttons
  • INRUSH mode for measuring surge current during motor startup
  • 1.65 in. (42mm) jaw opening (largest in its class) for conductors up to 550 MCM resists side torque
  • Rugged housing can withstand multiple drops onto concrete from height of 5 ft. (1.6m)
  • ETL certified CAT III 600V, CAT II 1000V
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Sale: $91.54
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Genera CM660

General Tools CM660 Dual Display Amp Clamp 750V

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Product Information

General Tools CM660 Dual Display Amp Clamp 750V
General Tools CM660 Dual Display Amp Clamp 750V is a multifunction AC/DC clamp meter with 16 functions and 49 ranges for a wide variety of electrical applications. General Tools CM660 also can take thermocouple temperature measurements, has a bar graph function and a bright LED work light.

Each meter combines the functions of a voltmeter and a clamp-type ammeter. The meters are designed for use in an industrial setting by HVAC/R contractors, building maintenance technicians, MRO (maintenance, repair and operations) personnel at process and power plants, electricians and electrical/electronic technicians.

The only difference between the CM660 and CM700 involves their current measurement range and resolution. Where the CM660 has a 0 to 600A measurement range and a maximum current resolution of 0.01A, the CM700 has a 0 to 1000A measurement range and a maximum resolution of 0.1A.

Both clamp meters are easy to use and ruggedly built. Each meets the ETL CAT III 600V, CAT II 1000V safety.

What's In The Box

  • Double-insulated test leads with screw-on alligator clips
  • K-type stem thermocouple probe & plug adapter
  • Batteries  
  • Soft pouch
  • User's manual
  • 3 Year limited warranty


General Tools CM660 Specifications
AC Voltage Ranges/ Accuracy 0 to 600mV/6V/60V/600V/750V / ±(0.8% + 3 digits)
DC Voltage Ranges/ Accuracy 0 to 600mV/6V/60V/600V/750V / ±(0.5% + 3 digits)
AC Current Measurement Ranges / Accuracy 0 to 60A/600A / ±(1.8% + 5 counts)
DC Current Ranges (via clamp) / Accuracy 0 to 60A/600A / ±(3% + 5 digits)
Resistance Ranges/ Accuracy 0 to 600Ω/6kΩ/60kΩ/600kΩ/6MΩ/60MΩ /
±(0.8% + 3 digits)@<1MΩ;
±(1.2% of reading+ 3 digits)@=1MΩ
Frequency Ranges/ Accuracy 0Hz to60Hz/600Hz/6kHz (clamp jaw);
10Hz to60Hz/600Hz/6kHz/60kHz/600kHz/6MHz/60MHz(test leads)/
± (1.5% + 5 digits) (clamp jaw);
±(0.3% + 5 digits) (test leads in Hz mode)
Capacitance Ranges/ Accuracy 0 to 6nF/60nF/600nF/6µF/60µF/600µF/6000µF/60,000µF/
±(4% + 5 digits)@>10nF)
Temperature Range (via "K " type thermocouple)/Accuracy -58° to 1112°F (-50°to 600°C) / ±(2% + 2 digits)
Duty Cycle Range/ Accuracy 1 to 99% / ±3%
Maximum Resolutions 0.1A, 0.1mV, 0.1?, 0.01Hz,0.001nF, 2°F/1°C, 0.1%
Clamp Jaw Opening 1.65 in. (42mm)
Dimensions 8.86 x 3.31 x 1.30 in. / (225 x 84 x 33mm)
Weight (including batteries) 14.8 oz. (420g) Power Source (included): 3 "AAA" batteries

General Tools CM660 Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Clamp Meters/Clamp Meters Template

True RMS What's This?Yes
Maximum Current AC What's This?600 A
Minimum Current AC0 mA
Maximum Current DC600 A
Minimum Current DC0 mA
Maximum Voltage AC1000 V
Minimum Voltage AC0 mV
Maximum Voltage DC1000 V
Minimum Voltage DC0 mV
Digits Display What's This?3.75
Counts What's This?6000 .
Auto Ranging/Manual What's This?Both
Auto Power OffYes
Detachable JawNo
Rotating Jaw / SwivelNo
Peak HoldNo
Dual DisplayNo
Analog Bargraph on DisplayNo
Remote DisplayNo
Continuity What's This?Yes
Temperature (K T/C)Yes
Temperature (IR Sensor)Yes
Diode TestingNo
CAT Rating What's This?III
CAT Voltage What's This?1,000 V, 600 V

Test Equipment General Attributes

Warranty3 YEARS
Power Supply VoltageBattery Powered
Safety ApprovalCE
Product Weight14.8 OUNCES (0.925 LBS)
Battery TypeAAA
Product Height9.37 IN
Product Length1.97 IN
Product Width3.62 IN
Shipping Weight1.5 LBS
Country of OriginChina


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