Can you calibrate this thermometer?

Yes you can. The nut on the bottom of the dial adjusts the needle to the correct temp. Google how to calibrate a meat thermometer for the best method.

Can this thermometer be used to determine melted wax temperature?

If you dip it in the melted wax I don't know why not. (Of course, then you've got the job of cleaning the wax off.) Read it while it is in the wax, just as you would read it dipping it in any hot liquid.

Does thermometer need to be at 0 before checking hot water? Don’t come with instructions and when putting into ice water, reads 40 not 0?

Not to my knowledge - just put it in to the water you want take the temperature of. You must be assuming Centigrade measures... in Fahrenheit 32 degrees is freezing; so unfrozen water, say with ice cubes added, measuring 40 degrees F. would make sense - about 8 degrees above freezing.

ASIN	B0747CJDHG
Age Range (Description)	Adult
Best Sellers Rank	#15,106 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #14 in Instant-Read Thermometers & Timers
Brand	KT THERMO
Color	Silver
Connectivity Technology	Wireless
Customer Reviews	4.6 4.6 out of 5 stars (2,803)
Date First Available	July 24, 2017
Display Type	Analog
Immersion Depth	1 Inches
Included Components	Thermometers, User manual, Plastic sleeve
Indoor/Outdoor Usage	Indoor
Is Discontinued By Manufacturer	No
Item Length	1 Inches
Item Weight	1.76 ounces
Item model number	B-1E
Manufacturer	KT THERMO
Model Name	B-1E
Outer Material	Stainless Steel
Power Source	Manual Winding Or Built-in Non-replaceable Power Source
Product Care Instructions	Wipe Clean
Response Time	1 seconds
Reusability	Reusable
Special Feature	Fast Reading System
Specification Met	CE, NSF
Style	Contemporary
UPC	712396023852
Unit Count	1.0 Count
Upper Temperature Rating	104 Degrees Celsius

KT THERMO Instant Read 1-Inch Dial Thermometer,Best for The Coffee Drinks,Chocolate Milk Foam

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