Spectrum Detector Mach 5 100kHz Digital Joulemeter USB TTL BNC SN 1843
Spectrum Detector Inc. Front panel shows BNC ports labeled detector output and external trigger TTL, plus a circular multi‑pin detector input. Unit is used with visible scuffs from handling. Inputs/Outputs: Detector input (multi‑pin circular), Detector analog output BNC, External trigger input BNC (TTL).