The brittleness tester conforms to JIS K 6261 / JIS K 7216 and determines the brittleness temperature and the 50% brittleness temperature of vulcanized rubber and plastics in a low-temperature environment. TM-2131 is the single type which comes with a set of sample holder, holding five samples, and TM2136 is the multiple type with four sets of sample holders with which four sets of five samples can be tested continuously just by turning a dial to change sample holders.