A digital indicator responsive to strain-gage inputs incorporates gage-factor adjustment by way of a dual-slope integrator operable in two modes, one of which modes entails upand-down integrations in relation to voltage references through different resistances, including a resistance which is adjustable to cause the indicator to produce a digital display of the existing gage factor, and the other of which modes entails upand-down integrations in relation to output of a strain-gage amplifier and one of the voltage references, respectively, through opposite ones of the different resistances; portable operation of the indicator is under control of an R-C and relay timing and switching network which prevents wasteful battery usages.