I have had it for over 10 years and it still holds up, also compared to another one that I have triple the value, the measurements are very close.

Very good construction, I am a student and not a professional, but I can say that this one looks professional. The battery is internal and non-rechargeable, I believe it lasts for a long time, but I don't know how quickly the backlight, which has an on/off switch, consumes it. The cables that come with it are also of very good quality. As for accuracy, I cannot judge because I don't have any other equipment for comparison. For measuring AA batteries for voltage, I got:
1.671V on a new one #1
1.672V on a new one #2
1.367V on a used one #1
1.364V on a used one #2
*both used ones from the same device

which show precise measurements. For measurement using the first connection, which is the input, the device states that at 10A/250V, usage is allowed for 10 seconds every 15 minutes, which may be a limitation for someone, with 10A being the limit.