PDFM 4.0-A-1-A : GREYLINE PORTABLE DOPPLER FLOWMETER. SINGLE HEAD TRANSDUCER WITH 12 FT OF CABLE. FOR PIPE SIZES 0.5"-180" (12.5mm TO 4.5m). BATTERY POWERED WITH 100-160 VAC LINE CORD / CHARGER. MOUTING KIT AND SONIC MOUNITNG COMPOUND. NOTE: NEEDS >100 PPM OF SUSPENDED SOLIDS OR AREATION 75 MICRONS FOR OPERATION.