The 4043E-1-440503-yyzz from Bird is a RF Power Meter & Sensor with Frequency 144 to 174 MHz, Power Range 33.98 to 56.99 dBm, Power Range Watt 2.5 to 500 W(Measurement Range), Resolution 0.2 dB. Tags: Inline Power Meter, Power Meter. More details for 4043E-1-440503-yyzz can be seen below.