what are these tray indents for?

[Duolab123]

I checked. Paterson makes what looks like a very nice spirit thermometer, 9 inches long, glass. I hate glass anything.

[Steven Ruttenberg]

I prefer my dedicated film developing metal thermometer with glow in the dark face. Need to get like 3 more and send em out to be calibrated. Works better than my glass one.

[Mark Sawyer]

To me, they always looked a bit Klingon in origin...

[Oren Grad]

I checked. Paterson makes what looks like a very nice spirit thermometer, 9 inches long, glass. I hate glass anything.

What they offer is two mercury thermometers, a 9-inch one intended for B&W and a 12-inch one with a longer scale intended for color.

[jp]

mercury thermometers

Dump some hot water in the tray by accident and watch them go pop!

[Duolab123]

What they offer is two mercury thermometers, a 9-inch one intended for B&W and a 12-inch one with a longer scale intended for color.

The listing on B&H says mercury which has been banned in the EU for years, they are colored liquid spirit thermometers, still a pain.

[Oren Grad]

...mercury which has been banned in the EU for years...

Ah, good point!