Combustible Gas Detector TIF8900 Combustible Gas Detector The TIF8900 is a super-sensitive, cordless, combustible gas detector that detects a broad range of natural gases including propane, methanol, butane, and gasoline.. Solid-state sensor technology, long life, and precision.. Adjustable sensitivity levels; as low as 5ppm.. Audible “Geiger counter” signal.. Rechargeable battery and charger included. No. TIF8900 – Combustible gas detector. Specifications Power Source – Two 2.4V Ni-Cad batteries (included) Battery Life – Approx. 4 hours per charge Dimensions – 8-1/2 L x 2-1/2 W x 2 D (21.59 cm x 6.35 cm x 5.08 cm) Operating Range – 32° F to 105° F Probe Length – 16 inches 8900