Retired products cannot be ordered

The Additel 226 and the Additel 227 are the recommended replacements

  • ADT221A



  • ±75.0000mV
  • ±30.0000V
  • ±30.0000mA
  • 1 to 50,000Hz frequency
  • 0 to 999,999 pulse
  • 14 to 122°F (-10 to 50°C) operating temp
  • 3.5 inch TFT color screen display
  • CE mark

What's in the Box

  • 110V/220V external power adapter
  • Chargeable Li-ion battery
  • 2 sets of test leads
  • Short circuit cable


The Additel ADT 221A multifunction temperature calibrator is a highly integrated, ultra-compact, and easy to use hand-held device for sourcing, simulating, and measuring temperature and electrical signals. It is ideal for calibrating, maintaining, and troubleshooting process instrumentation. The smart phone-like menu and interface simplifies operation and offers a variety of automation and documentation capabilities such as user defined tasks and tests.