P.I.D.:

Simple: PID Reading x CF = Actual PPM Present in Atmosphere

Entry Team Turn Back: Desired Reading on PID ÷ CF = Reading on PID in PPM

Predicted PID: 1300 Rule for Known Chemical PPM ÷ CF = Predicted Maximum PID Reading in PPM

Obtain 10% LEL in PPM: PLEL x 10,000 ÷ 10 = 10% LEL in PPM