Thermal Light

I love this app and have used it for years to double check my heat treat oven calibration It is no longer compatible with iPhone OS and does not work at all now If they ever update I’ll change my review to 4 stars

I thought this would be handy for HTing knives, but I haven't had any luck with it. I tried calibrating then using it to read a steel that I knew the austentitic temp for, in light and dark, but could not get an accurate read.

Of all the apps I have bought this one is almost totally useless. To calibrate you are supposed to point it at a light and keep trying until you get the x in the magic spot. So I do this for the low temp then the high. But find out that whatever one you have it calibrated it losses the previous calibration. Oh well I think I can work around that so I calibrate it again for the low temperature. Note: I did this in my garage at night. Then stepping outside to where my metal melting furnace is running. Now the thing says it needs calibrated again. So one more time trying to calibrate this at the operating furnace. I can not get it to calibrate looking down in the glory hole where my crucible is. This even though the crucible is red hot . At this time on a scale of one to ten = 0