If you are looking for a great flowmeter for measuring fuel, diesel, and other petroleum based liquids an A1 aluminium flowmeter is the meter you’re looking for. The lithium battery powered electronic LCD is calibrated to read in litres and gallons and displays accumulative total, batch (reset) total and rate of flow, eg. litres/minute.
These flowmeters come in 1 in and 2 in. models.