Review on Lancoon Handheld Thermometer Hygrometer: Accurate Temperature and Humidity Meter for Indoor/Outdoor Use - Includes Dew Point/Wet Bulb Temperature and Battery by Brent Borseth

I needed this for astronomy (in the dark). They have several serious problems: - The display that shows which parameter is being measured (there are several) is so small that I can't see it without a magnifying glass. - The dew point display is not available at the same time as the temperature. The main purpose of observing the dew point is to find out how close the existing temperature is to the dew point; that's how much "margin" you have. But on this device I have to switch screens to see both. Dew point and temperature must be on the same screen! - The backlight only comes on briefly when you turn it on. If I want to read again later, I have to turn it off and on again. It should have a backlight switch. I would send it back but it seems like all similar devices are really the same, relabeled and I need something until I find a better one.