Test that the oil is at the correct temperature by gently dropping one veg strip into it - it should start sizzling immediately, if not, wait until it does before adding more veggies.
Don't lower too many strips into the oil at once, otherwise the oil temperature will drop.
Unless you serve the strips immediately, place them on an oven tray lined with parchment paper and reheat them when required.
Metric kitchen scales are an inexpensive yet invaluable gadget to enable accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click
HERE for the ones I use (UK Link). For U.S. option click
HERE.