The S-meter for SmartSDR is available. — FlexRadio Community
Protmex PT6708 Sound Level Meter, Digital Decibel Reader Measurement, Range 30-130 dB, Accuracy 1.5dB Noise Meter with Large LCD Screen Display, Fast and Slow Selection (Batteries Include): Amazon.com: Industrial & Scientific
VHF
Amazon.com: CB Ham Radio Galaxy Northstar S Rf power replacement meter base swr watt gal1 : Electronics
Transparent S Meter
S Meter Accuracy - Not So Much Really - Making It Up