Hensel Strobe Wizard Plus FREEMASK Transmitter

While the Hensel Strobe Master Light Meter is not required for use with the Hensel Integra strobes, if you wish to meter your strobes' output, then a handheld incident meter of some type would be needed. The Nikon D7100 DSLR camera's internal meter is designed to read reflected light, not incident light, and is only designed to meter Nikon's i-TTL flashes or units used on the camera's hot shoe. The whole point of using studio strobes is for the ability to manually set the flash exposure for consistency, but SLR/DSLR cameras are not designed to calculate studio strobes' exposure (though there are a few new options that have recently been released that are starting to add TTL capability, though this is not the norm for most studio flashes). If you do not wish to use a handheld light meter, some people simply take the image, then use the histogram on the rear of the camera to check exposure. While this is not as accurate as using a light meter, it is an option if you do not yet own or wish to purchase a light meter. So, long story short, no, the Nikon D7100 DSLR camera's internal meter will not meter studio strobe lighting.l

The battery is accessible by removing a screw at the bottom, which holds the top and bottom of the unit together. You would need a CR-2 3V lithium battery to serve as a replacement. Please see the link to the battery for reference: http://bhpho.to/1Hpd1HN

Yes; as the Nikon D7100 DSLR camera has a standard ISO hot shoe, the Hensel Strobe Wizard Plus FREEMASK Transmitter may be used on the Nikon D7100 DSLR camera to wirelessly trigger Hensel strobes that have the Hensel Strobe Wizard Radio Receiver built into the strobe/power pack, or which have the Hensel Strobe Wizard Plus Radio Slave Remote Control Receiver (B&H # HESWPR) attached to the unit.