Fusion splicers are very expensive, under $10k is the cheap end. ISPs own them of course for field work but home installs are often done by small independent co

Fusion splicers are very expensive, under $10k is the cheap end. ISPs own them of course for field work but home installs are often done by small independent contractors (one-person companies are common) without the budget. The situation has improved a lot over the last few years, but historically fusion splicing was such a delicate process with sensitive equipment that ISP crews would pull around an air-conditioned trailer just to house the splicer and its operator. Actually these trailers are still the norm, but the machines have also come down in price and up in flexibility so they aren't so necessary any more (but I'm sure it still really helps productivity to have your tools on hand and not be dripping sweat on the workspace if you do this all day...). But in any case I find it more likely the installer was using an inspection probe/microscope to verify a field assembly connector than actually splicing. Most field assembly methods don't require a microscope but it's common to use a specialized type of microscope to check the correctness and quality of the face of the connector before use, to avoid future callbacks, which said independent contractor will be penalized for.