Additel 221A Multifunction Temperature Calibrator User Manual - Manual (Page 14)

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4. Cautions
◆ Do not connect the test leads before toggling to another measurement or sourcing function.
◆ Do not touch the metal parts in the test lead interface to avoid introducing errors.
◆ Never apply more than 30V between any two electrical jacks (except when measurement is 30V range).
◆ To avoid water penetration into the calibrator, regular cleaning and maintenance is recommended.
◆ Only use the power adapter supplied by Additel to recharge battery.
◆ In the event of an abnormality phenomenon, power off the device and take off the battery. Then contact the
factory for troubleshooting.
◆ Do not disassemble the calibrator. Any problems caused by that are beyond our service range.