Even in total darkness you can read the minutes and seconds on GraLab's Model 300 Darkroom Timer. It is used in industrial/commercial photo labs, graphic arts, printing and hobbyist darkrooms and is probably the most popular darkroom timer of all time. Set by seconds, minutes or a combination of the two, GraLab's exclusive dual-cam system gives you exact timing over long intervals. Two, three-wire receptacles can control an enlarger or printer and safelight with a combination time/focus switch. Rubber base pads, wall mounting keyholes and a recessed hand grip on the 7-1/2" x 7-1/2" x 2-1/2" polycarbonate case, gives you multiple placement choices.
| Minimum Setting | 1 Second |
| Total Range | 60 minutes, by minutes and seconds |
| Automatic Buzzer | Constant tone |
| Accuracy | +/-.015% @ maximum setting |
| Voltages | Input voltage 100-130 VAC, 50 or 60 Hz |
| AC Outlet Power Rating | @120 VAC |
| Max Lamp Load | 600W |
| Max Resistive Load | 1200W |
| Max Motor Load | 1/3 HP |