They eat 9V batteries if you forget to turn them off too;
Most, if not all, cheap 830 meters like the three I have shown below have no auto power off. However, I measured the current consumption of the 830s when measuring DCV using a Fluke 87. As you can see it varies quite a bit even though I'm led to believe all 830s are more or less created the same.
All figures below were recorded using min/max. I reported the max and rounded up.
DT-830D - 1056uA
M-830B - 968 uA
DT-830B - 298uA
Fluke 75 - 276.8uA (2,000 hour battery life on 9V battery)
So if we estimate 1mA for the average 830, that should give around 400 hours of use assuming a 9V is 400mAh.
On another forum where I participate, I estimate that 80% of the people asking for help have 830 variations. About once every two weeks, we get people with 830 meters reporting 10VDC readings on a 5V standby rail.
Invariably, the cause of this bad reading is a 9V weak battery in the 830. However the 830 lcd, even though it has a low battery indicator, is
not on. Once we convince the user to put in a fresh battery, the 830 usually gives correct readings.
BTW, the 2 yellows ones were non functional when I received them. I managed to "repair" them back to working order with advice/suggestions from modemhead. I spent a lot of time doing it, but I learned a lot about.
oh, I forgot, so do my Fluke meters.
I'm curious which model handheld Fluke multimeter eats batteries. I'm guessing the 233, 87IV/89IV/187/189, or 287/289. Most of the other models are in the 300-400 hour range. The current 28II is 800 hours on 3 AA batteries. Most of the modern ones have automatic power off.