The Kenko (Minolta) meters run of a single AA battery have auto switches itself off if they are not used for ten minutes, a battery lasts for thirty hours continuous use, I'm still using the original battery that was supplied in the box of my Kenko KFM 2100 ( Minolta Auto meter V1) when I bought it new three years ago.
The Gossen Digipro is also an excellent meter for flash use that has auto switch off and also runs on a single AA battery.
Most people just use incident metering in the studio with flash
Originally Posted by 77seriesiii
You need to check for brightness ratio (bright side to low side) - but thats about it.
You can spot meter in the studio in the same way you spot meter outside - just make sure you take the spot readings from the camera position and watch out for flare from the flash heads.
If you use spot readings a lot outside then you perhaps might want the feature for flash.
Personally, I use a lot of spot meter readings outside for landscapes but have almost never felt the need to spot meter in the studio
The Kenko units are good, as are the Sekonic and Gossen units.
I have just switched from seconic 308 to a minolta flashmeter IV. So far I'm impressed.
I use a Sekonic 758DR but if you want to avoid the outlay get a Sekonic L358. Excellent meter and you can purchase the remote trigger capapbility as well.