Mini Clamp Meter with Temperature for HVAC/R - SC45

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Mini Clamp Meter with Temperature for HVAC/R - SC45

Mini Clamp Meter with Temperature for HVAC/R, model SC45, was designed to include most of the features and ranges you use in HVAC/R field service in a compact=



Mini Clamp Meter with Temperature - A Solid Performer in the Field or a Great Backup Meter - SC45
The Mini Clamp Meter with Temperature for HVAC/R, model SC45, incorporates a lot of big meter functions into a compact, easy to hold and use design.  While it’s not exactly an all-in-one multimeter, this manual and auto ranging DMM includes most of the ranges you use in HVAC/R everyday. Along with standard multimeter ranges, we designed the SC45 to include capacitance (MFD) and temperature with great compensation. And to add to that, we designed it with built-in non-contact voltage and a continuity beeper to give you a powerful HVAC/R meter that’s under 8-inches tall. Makes a great backup or a solid performer for everyday testing.

 The SC45 dial is easy to operate with one hand. It’s compact design allows you to select the range you need using one finger or thumb and get the job done fast. Be sure to refer to the Operator’s Manual for safety information and warnings and use safe testing practices when hooking up your multimeter to any refrigeration or heating system.

Selecting Ranges
Like the SC44, the SC45 includes a range button. A lot of technicians tell us they like that you have to think about what you’re hooking up to before you test.  

To switch to manual ranging mode, simple press the range button (looks like a two-ringed bulls eye) and hold for about two seconds until the symbol appears in the upper left of the LCD.  

For DC voltage, set the meter to the VDC parameter instead of VAC (shown below). For all ranges choose a range just above the value you expect. If display reads “OL” (overload), select a higher range. If display shows less than three numbers, select a lower range for better resolution.


Like all of our test instruments, the main benefit of the SC45 is that it was designed specifically for HVAC/R field service. It’s rugged, has with built-in safety features and includes most of the ranges you need for everyday testing. Some of the highlights include:
Take ambient air or refrigeration line temperatures and more with the built-in K-type port and the included ATB1 wrap tab thermocouple. Add a wet sock (saturated tissue or a shoelace to take wet bulb temperatures. The built-in temperature junction offers great temperature compensation for more accurate and faster measurements.

Capacitance (MFD)   
Measure microfarads on motor-start and motor-run capacitors to check for degradation. Don’t forget to discharge the capacitor before testing.

Using the amp clamp, read 0-400 amps directly on your meter with 0.1 resolution.

Wire Grabbing Jaw
The amp clamp is shaped like a jaw to make separating and grabbing a single wire easy using only one hand.

Non-contact Voltage
With the NCV tab on the tip of the clamp close to an AC voltage, press and hold the NCV button. The NCV LED will light with an analog feel and the beeper will beep. The closer you get to AC voltage, the louder the beep. The NCV function is sensitive enough to detect 24VAC on thermostats (24V to 600V, 50Hz to 60Hz).  

The HOLD button is easily pressed with your thumb (or forefinger for lefties) while holding the mini clamp meter naturally in your hand. It holds any reading on your SC45 so you can concentrate on the test points, disconnect, and then look at the LCD.

And More:

  • Volts AC.
  • Volts DC.
  • Resistance (Ohms).
  • Continuity.
  • Range button to switch between auto and manual ranging.
  • Rugged ABS case.
  • Ergonomic shape fits naturally in your hand.
  • Auto power-off (APO) to conserve battery life.
  • Compact size – only 8” tall.

The SC45 has features and benefits of many full-size meters in a design that is only 8-inches tall. The built-in non-contact voltage sensor (NCV) sensor tells you if a line is hot or not before you work on it. The continuity beeper tells you if a circuit is open or closed. And the hold button on the side of the SC45 allows you to concentrate on the test point, hold the reading and then look at the display after you’ve disconnected.


  • Mini Clamp Meter with Temperature for HVAC/R - SC45
  • Vinyl Test Leads
  • One (1) Wrap-Tab K-type Thermocouple - ATB1
  • Mini Clamp-On Meter Case - ANC4
  • Two (2) 1.5V “AAA” batteries (installed)
  • Operator’s manual

Display: 3¾ digit liquid crystal display (LCD) with a maximum reading of 3999.
Range: Manual ranging mode, hold button for 2 seconds to return to autoranging mode.
Overrange: "OL" or “-OL” mark indication.
Auto power off: 10 minutes.
Operating environment: 32 to 122°F (0 to 50°C), at <70% R.H.
Storage temperature: -4 to 140°F (-20 to 60°C), @ <80% R.H. with batteries removed.
Accuracy: Specifications good in ambient conditions of 74°F ±8°F (23°C ±4°C), <75% relative humidity.
Temperature coefficient: 0.1×(specified accuracy) per °F/°C; 32 to 66°F (0 to 19°C); 82 to 122°F(28 to 50°C).
Altitude: 6561.7 feet (2000m).
Power: Two AAA 1.5V batteries.
Battery life: 300 hours typical with alkaline
Accessories: One pair test leads, (2) 1.5V AAA batteries (installed), wrap tab k-type thermocouple, carrying case and operating instructions.
Safety: Designed to meet IEC61010-1 (EN61010-1) and IEC61010-2-032 (EN61010-2-032), CATIII 300V, class II and pollution degree 2 indoor use comply with CE, C-tick certified.

-30 to 400°F (-34 to 204°C)
Resolution: 0.1°
Accuracy: ±1°F (32 to 120°F); ±0.5°C (0 to 49°C),
±1% + 1.5°F (-4 to 400°F);
±1% + 1°C (-20 to 204°C),
±2% + 4°F (-30 to -4°F);
±2% + 2°C (-34 to -20°C)
Sensor type: K-type thermocouple

Range: 4μF, 40μF, 400μF, 4mF 4.000mF = 4000μF
Resolution: 1.0nF
Accuracy: ±(3% rdg + 10 dgts) on 4μF
±(3% rdg + 5 dgts) on 40μF to 400μF
±(5% rdg + 20 dgts) on 4mF (4000μF)
Minimum input range: >100nF
Safety: “dsc” symbol on LCD indicates that the capacitor must be discharged before testing.

DC volts
400mV, 4V, 40V, 400V, 600V
Resolution: 0.1mV
Accuracy: ±(0.5% rdg + 2 dgt)
Input impedance:
400mV > 100MΩ
4V = 10MΩ
40V~600V = 9.1MΩ
Transient protection: 6kV for 10μ sec

AC volts (50Hz - 500Hz)
Ranges: 4V, 40V, 400V, 600V
Resolution: 1mV
Accuracy: ±(1.2% rdg + 5 dgts), ±(1.5% rdg + 5 dgts) on 600V range
Input impedance: 4V = 10MΩ, 40V~600V = 9.1MΩ

Ranges: 400Ω
Accuracy: ±(1.0% rdg + 4 dgts)
Open circuit volts: -1.2VDC

AC Current (50Hz - 60Hz)
Ranges: 40A, 400A, Resolution: 0.01A
Accuracy: ±(2.0% rdg + 6 dgts)

Audible indication: Less than 25Ω
Response time: 500ms

Overload Protection
AAC - 400AAC
Resistance - 500VDC or AC RMS
Continuity - 500VDC or AC RMS
Capacitance - 500VDC or AC RMS
Temperature - 60VDC or 30AC RMS

Field Temperature calibration    SC60_calibration
For accuracies of ±1°, calibrate to a known temperature. A glass of stabilized ice water is very close to 32°F (0°C) and is usually very convenient but any known temperature can be used.

  1. Select 400°F/C range and connect thermocouple.
  2. Remove back case (2 screws on back, one near clamp, other near base). Leave battery cover attached so batteries stay within back case.
  3. Stabilize a large cup of ice water.
  4. Immerse the thermocouple tip and let it stabilize.
  5. To change the temperature scale to °C, close the jumper just below VR5.
  6. Adjust VR5 calibration pot with a small screwdriver to get within 0.1° of 32°F (0°C). Each 1/4 turn should adjust the temperature about 3°, no more than 10° total. There’s no need rotating the screw more than 360°; doing so gets you back to where you started.
  7. Attach case without screws to preview the temperature and continue until you have it dialed in.