"This is the best vulcanizer I've ever used. It will cook big mold frames, 6"x8". It's vewry sturdy. I tested the temperature controls. I knew that the numbers on the temperature dials only indicate approximate temperatures. I used my thermometer to find the exact temperatures that I wanted and made little marks on the temperature dials. This allows me to set the vulcanizer within 5 degrees of what I want every time I make a mold. I use my thermometer to tweak the setting before I vulcanize a mold. This vulcanizer holds a temperature like no other that I've every used. The 'heating' light comes on about 3 degrees below the temperature I set. It stays on while the platen heats to about 3 degrees above the temperature I set, every time. My old vulcanizer began heating about 10 degrees below the set temperature and heated to around 10 degrees above the set temperature. I am totally happy with this product."