B002VLZ2JK GraLab Model 300, 60 Minute Photography and Darkroom Timer, 7-1/2″ Length x 7-1/2″ Width x 2-1/2″ Height

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60-minute timer has 6.5?ace (Diameter), with luminous numerals, dial, and hands for enhanced visibility in darkrooms
Two hands for setting by minutes, seconds, or a combination of minutes and seconds
Two outlets for automatic switching between enlarger or printer and safety light
Electric motor provides + or – .015% accuracy
Nonconductive plastic case with rubber base pads help protect against impact, chemicals, moisture, and electrical shock