Yes it is, I remember the electronic school 30years ago, thanks for reminding me. I desoldered the resistor and now I can switch LED's . Perfect.
At the moment, I try to control the radiators in the house with this ENVIII. I have diffrent meassuring instruments here, I will check next week how they are to compare with the ENVIII
Witch tolerances does your AZ device have? Must been shown in the manual.