The TG1 is the updated model number of the PE-1. New white packaging too. But same unit.
We are selling to a number of different hobbies and industries, so we wanted to move away from the reptile specific inference, less confusing for the home inspector or horticulturist looking for a temp gun : )
As for the measurement, what you are you temping out? When you hold the button down, it will give you continuous feedback of surface temps. Once you let go of the button, it will hold the reading for the last temp measured.
Remember that a temp gun measures reflected surface temps, not air temps. The infrared "shoots out" in a cone shape. The further away you are from your object, the larger the area you are temping. The TG1 unit has a 1:1 Distance to Spot ratio, so at one inch away you are measuring a one inch spot. At 6 inches away, a 6 inch spot.
The PE-2 unit uses a tighter 6:1 ratio.
I typically use the TG1 unit at 3 inches or less when measuring cage and setup temps.
Also remember that a temp gun won't measure through glass or plastic, but rather the surface of the glass itself. Glass, plastic, clear liquids, they are all completely opaque to an infrared temp gun.
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