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GraLab 450R Mechanical Darkroom Time
The Model 450 is a single memory-switching timer. It offers simple operations and adjustable, highly visible, 2-digit LED display. It has easily adjustable controls for display brightness, AC outlet power, audio signal choices and countdown time ranges.
The two countdown time ranges are seconds up to 99 and tenths of seconds up to 9.9. The three audio signal choices are off, metronome and end-of-cycle tone. The AC outlet power can be switched between "on" all the time or "on" in timer controlled operation.
• Size: 3.5" x 4" x 8"
• Accuracy: ± .01% @ 1 second relative to power frequency
(20°C ambient, no load)
• Repeatability: ± .005% @ 1 second relative to power frequency
(20°C ambient, no load)
• Temperature Range: 0°C to 55°C
• Humidity: 0 to 95% non-condensing
• Voltages: As printed on ratings label
• Power Ratings: As printed on ratings label
• Timer Range: SECS: 1 - 99 seconds 1/10 SECS: .1 - 9.9 seconds
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