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For exact, fully automatic timing of all darkroom work. Interval and remaining time indicators. Enlarger goes on and safelight goes out when push button is. User manual for the Time-O-Lite P72 60-Second Darkroom Timer contain basic instructions that need to be followed during installation and operation. High quality copy of the original Industrial Timer Corporation instruction manual for their Time-O-Lite darkroom timers. 5¼" x 5¾" format. Staple bound.I search online for the user manual of the TIME-O-LITE MONITOR. I see a reference on KEH website for a user manual that included all models Operating instructions and pdf manual for use - Time-O-Lite User manual If you have lost or thrown out the CD with the Time-O-Lite manual and you need The user manual for the Time-O-Lite P72 60-Second Darkroom Timer TLP7260S provides necessary instructions for the proper use of the product Photography - Have you lost your user manual? Download the Time-O-Lite manual in which you will find instructions on how to install, use, maintain and service your product.