Why can't you use the laser you have indoors?
As I understand how a laser reciever works---it senses the pluses of the beam. In the case of a rotary laser the beam moves past the sensor as it spins and the sensor picks the interruptions up. On the fixed line lasers the electronics pulse the beam, the sensors picks up these interruptions. All of this happens so fast it appears to the eye as a solid line.
The one on sale I linked will work with a reciever, the receiver is available as an option. The kits I have the reciever was included.
As long as the clamp on the reciever is wide enough it will work with your grade rod. My guess (only a guess, is the rods are a standard width?).
My favorite option and why I bought the brand initially is the fine tune rotating base. Came standard in the kits when I bought them.
Tom