Требуется свидетельство о поверке? Может, радиоприёмник?
https://www.sdrplay.com/rspdx/
https://www.sdrplay.com/rsp2/
• Covers all frequencies from 1kHz through VLF, LF, MW, HF, VHF, UHF and L-band to 2GHz, with no gaps
• Receive, monitor and record up to 10MHz of spectrum at a time
• Enhanced ability to cope with extremely strong signals
• External clock input for synchronisation purposes, or connection to GPS reference clock for extra frequency accuracy
• Excellent dynamic range for challenging reception conditions
• Calibrated S meter/ RF power and SNR measurement with SDRuno (including datalogging to .CSV file capability)
• Documented API provided to allow demodulator or application development on multiple platforms
У меня есть RSP2. Действительно, калиброван. Сертификата не дают, параметров не гарантируют, но нареканий нет у меня, ни у других владельцев на качество калибровки мощности не припомню.