zero adjustment

Since we discard a month with zero adjustment, we don't have to track discarded adjustments.

Just so you keep everything steady, don't let the preamps or the scopes go off their zero adjustments."

First, the indication of the resistance was completely independent of the battery voltage (as long as it actually produced some voltage) and no zero adjustment was required.

The technical specifications of these devices were often crude, for example the one illustrated has a resistance of just 33 ohms per volt, a non-linear scale and no zero adjustment.