The xcortech x3300w is a combined chrono and tracer unit with a basic mosfet. It features an amazingly bright tracer and an external peq styled unit which displays:

Ammo counters (up and down)

Rate of fire (rpm)

Speed (fps)

Burst (using the optional mosfet)

AEG battery voltage display and warning (using the optional mosfet).

It might not be one of the lightest or most compact but it is solid (many people can attest to this just ask around) and is very bright. Unfortunately I had to file it down a little (<0.5mm) to fit inside my rail. Selling as it doesn't fit with my current front end set up (make sure to check this!). Any questions or offers pm me.