1600 degF is rather low for some of the high alloy toolsteels: example D2: "ramp to Austenitizing temperature at 1790F to 1850F" or A2 "Austenitizing temperature 1720F -1760F". And don't even think of the HSS alloys like M2 "Preheat at 1450 F before heating for hardening. Then heat rapidly from 1450 F to 2200 F and hold for 3 to 5 minutes followed by quenching in oil, air or salt bath."
Of course it's great for steels like 52100, 1095, 5160, etc.
So depending on what you work with the Raytek Raynger MX4+ might suit you fine; or not.