Extech Calibration Source Checker

The Extech Current Source Checker instantly determines if a device needs calibration.


  • Checks meters and controllers
  • Simulates ranges of 4mA, 12mA and 20mA
  • Accurate to 0.1mA
Your Price $112.99
Usually ships in 1-2 weeks
Free Lifetime Tech SupportFree Lifetime Tech Support
ImagePart#Product DescriptionPriceStockOrder
Extech Calibration Source Checker412440-S Calibration source checker
Usually ships in 1-2 weeks
Extech Calibration Source Checker 412440-S-NIST Calibration source checker, NIST traceable
Usually ships in 1-2 weeks

The Extech Calibration Source Checker is a low cost, pocket-sized checker for simulating current loops. The instrument simulates ouput ranges of 4mA, 12mA and 20mA from a transmitter. Bright LED's will indicate simulation output or battery status, and an overload indication will alert users when a load exceeds 240Ω. The checker is ideal for checking calibration and as a current source for setting up engineering units on a process indicator or controller.

  • Dimensions: 3.5 x 2.3 x 1" (89 x 58.4 x 25.4mm);
  • Weight: 10oz (283.5g)
  • (1) Source checker
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