After making a mistake where I was sure the conatiner I was using to measure my mash and sparge water was 2L and it was actually 4 Liters, I've decide to try and find a flow meter with can be attached to a hose so I can measure the water going into the HLT. A sight tube is not an option for me at the moment.
Does anyone know where a flowmeter can be obtained? How accurate? How much?