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Temperature-Compensating Development Timer

Compensating TimerThe Compensating Development Timer will help take the hit-and-miss out of timing the development of photographic film and paper under off-nominal temperature conditions. By measuring the temperature of the developing solution continually during development, and adjusting the timer rate accordingly, correct development is assured even as temperatures vary during development.

The Temperature-Compensating Development Timer is designed to be extremely simple and intuitive to use. It is simply a digital stopclock, which runs at a rate dictated by the temperature of the developer solution.

Price: £220 inclusive shipping

US customers please purchase from our US distributors CatLABS of JP


Optimised for use in the darkroom

  • Large, clear, LED display

  • Illuminated run/reset switch

  • Display illumination safelight red

  • Clear, high contrast panel legends

  • Selection controls are rocker switches - easy to determine settings by touch in total darkness

  • Display has bright, dim and off modes - "dim" mode designed to be visible in near-darkness with minimal fogging risk on sensitive emulsion. "Off" mode blanks the display completely (timing beep in "off" mode" at thirty second intervals)

  • Chemical-resistant fascia, rear printed on clear polyester for durability

High Performance:

  • High-precision stainless-steel thermistor temperature sensor

  • 10-bit analogue-to-digital conversion

  • High performance digital processor

  • Computations carried out to 0.1 deg. C resolution

  • Wide operating temperature range from zero to 54 deg. C.


  • Implemented temperature co-efficient 2.5 (equivalent to using Ilford tables). Can be supplied with alternative coefficients implemented at a small charge.

  • Provides temperature display (digital thermometer mode) when timer not running

  • Battery-powered (2xAA - not included due to shipping rules)

  • High Efficiency LED displays provide long battery life (>1000 hours with display "dim")


All the below accessories are included with your timer. All are also available seperately - see spares and accessories.

Compensating Developing Timer The Compensating Developing Timer Unit
Temperature Sensor Probe Temperature Sensor Probe - a precision stainless-steel thermistor with 1m connecting cable terminated in a 3.5mm jack connector. Cable can be extended using a male-to-female 3.5mm stereo (three-pole) jack lead.
Foot Switch for compensating developing timer Foot Switch for compensating developing timer. Switch duplicates the function of the "run-reset" button on the timer and allows hands-free operation. Fitted with 2m connecting cable terminated in a 3.5mm jack connector. Cable can be extended using a male-to-female 3.5mm stereo (three-pole) jack lead.
Wall Cradle for Compensating Developing Timer Wall Cradle for the Compensating Developing Timer. Includes wall fixings. Allows drop-in, lift-out of the timer.
Sealing Gland Sealing Gland - allows temperature sensor to be sealed into a tank cover, permitting inversion agitation with the sensor fitted. Requires half inch / 12mm hole.

Instruction Booklet Picture
Instruction Booklet - 10 pages, also downloadable here.
Tray Clamp for Compensating Developing Timer Tray Clamp - holds sensor to tray for tray developing. Acetal plastic with nylon screw. Clamp secures to tray with clamp screw, sensor drops in through hole in clamp.

For technical support with your product please contact technicalsupport@dlgelectronics.com.  

Please Contact Us if you have any queries or need any further information.

Price: £220 - free shipping
USFlagUS customers please purchase from our US distributors CatLABS of JP CatLABS 

rBox Contents


Spares and Accessories

We stock a full set of replacement parts - please visit our spares and accessories page.

Documents and Downloads

Instruction Manual for the Temperature-Compensating Development Timer

Time-Temperature Charts - a selection of time-temperature charts at different temperature coefficients, and guidance on developer temperature coefficients. 36 pages, including 25 time-temperature charts for different temperature coefficients. pdf file, 730KB. Free Download.


A short YouTube video describing the timer and its use.




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