I have a real power meter. That is, a meter that uses directional couplers and attenuators, etc. I have compared my Bird 43 to it. On 23 cm, the Bird is OK. Depending on the slug, it is within 5% of the power meter. On 2304, it is off by 10%. I have never compared a Comet or any of the other meters that are available. Could be interesting.?