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• When checking the calibration of the measuring instrument against a standard potentiometer, account must be taken of [or one should take account of (or take into account)] the effect of ...

• As with all internal combustion engines, allowance must be made for the effects of (or the effect of ... should be allowed for) every ...

• In the comparison of these results, consideration must be given to the temperature difference.

• Piezo-electric crystals tend to be very sensitive to temperature changes and this must be allowed for during calibration. The period of time to which measurements relate also deserves consideration.

• In adding ... due regard must be had to direction.