Martindale Electric Proving Unit PD430

Is contamination found on the unit?

Clean the unit with a damp soft cloth

Is a mild detergent necessary for cleaning?

Clean the unit with a mild detergent

Thoroughly clean the unit with a water dampened soft cloth after using detergent

Unscrew the captive screw at the end of the battery cover

Slide the battery cover downwards and lift it clear

Fit new batteries observing correct polarity

Ensure no old batteries are mixed with new ones

Position the battery cover into the rear casing slots

Slide the battery cover upward into position