Just great, it's always ready for immediate use, since it does not require batteries or button cells (how many other devices). A great big display in use, it is also illuminated. Property already different devices had, but this beats them all. Since this unit even measurements from 0.1 watts are possible (what the previous device could not), I have now been able to make some standby power guzzlers in the home identify. For me this is enough ELV "Basic" device and is highly recommended. For those who need memory locations or who deduct after the display requires further from the power supply, which is certainly well advised also to the ELV "professional" device.