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An 8-digit code by email. No password — and the same box signs you back in.

Your first guided investigation is free

The app leads you through it a step at a time, says why each step, and takes it right through to a verdict. No card, nothing to install.

Tick the Terms box above and the button unlocks.

11 tools work without an account — the Refrigerant Converter, Power Calculator, Pressure Test Checker and more. Sign in for Measurements, the job paperwork, and your Pro plan.