A home built torsional rheometer is presented that consists of a measuring cell with a double slit arrangement. This double slit arrangement guarantees a quick cooling down of the sample which is of major importance for the observation of the start of the solgel transition under isothermal conditions. This torsional rheometer is based on an earlier version of a home built dynamic viscometer. The modifications are focusing first and foremost on the miniaturizing of the measuring cell. This results in high cooling rates, small volume of the sample, small weight of the oscillating cylinder, and therefore a relatively large range of frequencies.