Range Dial can read temperatures from 50ºF to 450ºF (10ºC to 230ºC). All Range Dial probes can withstand temperatures up to 450ºF (230ºC), including the cable. The black Range Dial grill probe has a braided steel cable that can withstand temperatures up to 720ºF (380ºC).
No cooking thermometer can withstand direct flame for long, so keep your Range Dial probe and its cable away from flames. The braided steel cable on the black probes that come with Range Dial Grill Pro protect against flare-ups on the grill, but the silicone handle and probe still shouldn't be exposed to fire or temperatures above 450ºF.
Operational temperature range for the Dial base — the round part that contains the electronics and batteries — is 32ºF-104ºF (0ºC-40ºC). Most batteries will have trouble in very cold weather, but lithium batteries like Energizer's Ultimate Lithium L92 can work at temperatures as low as -40ºF.