Robinair TIF8801 Replacement Sensing Tip for TIF8900 Broad-band battery operated solid state electronic combustible gas detector Provides a Geiger counter ticking signal which increases in frequency as the source of combustible gas or vapor is approached Excellent for pinpointing the location of combustible gas leaks as low as 5 PPM Ideal for pinpointing known leaks checking for leaks and verifying safety of potentially hazardous locations Includes a carrying case owners manual rechargeable batteries and recharger TIF Instruments TIF8801 Replacement Sensing Tip For TIF8900 TIF Instruments Replacement Sensing Tip for TIF8900 is a sensing tip for combustible gas detectors. It is compatible with TIF8900. Replacement sensing tip For TIF8900 combustible gas detector.