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I really love this thermometer, but I use it for an outdoor thermometer, not for a darkroom. It's hard to find one that is accurate, has a large dial, and lasts outdoors (you can find one or two of these, but not all three). I've had it sitting on a window sill, mostly shaded except for the late afternoon sun, for the last three years. The red ink is light orange now; the black ink is black and has not faded.# Accuracy: ± .25% at 68°F and within ± 1% over the remainder of the range# Range: 25° to 125°FThat accuracy beats any other thermometer or thermistor I own, not that I buy cheap stuff, but I've looked up the specs of other thermometers and thermistors I own and they're not as accurate. Granted, it's accurate at the temperature you'd be operating darkroom fluids at and not over a few hundred degrees like most K-style thermistors.That's /- 0.17F at 68F and /-1F at 100F.