The bomb isoperibolic calorimeter BIC 100 (produced by JSC «BMC», Belarus) depending of the class of built-in sensors, present oneself: 1) a scientific and research instrument for precise measuring of combustion energy for individual organic substances with C, H, O composition; 2) a measuring device for testing of gross calorific value at a constant volume in accordance with ISO 1928:2009 and GOST 147-2013 (solid mineral fuels), EN 14918:2010 and GOST 331062014 (solid biofuels), EN 15400:2011 and GOST 33108-2014 (solid recovered fuels), ASTM D 240-02 and GOST 33299-2015 (liquid hydrocarbon fuels) and so on; 3) included in national standard of combustion energy unit of Republic of Belarus. This calorimeter consists of a thermostat (water jacket with constant-temperature) connected to the cooling block and measuring-calculating block, arranged in a single housing. Inside the thermostat is the chamber (enclosed on all sides) wherein the calorimeter can (with calorimetric bomb) is installed. The external view of this device is available online (http://bmc.by). The calorimeter does not require connection to an external cold source for resetting excess heat, because it has a built-in cooling block. The thermostat lid is a separately constructed hollow lid with channels inside, which are connected to the thermostat by the pump that is disposed on the sidewall of calorimeter. Measurement of temperature in the calorimeter is carried out using two 100 Ω platinum resistance thermometers (PRT) of difference classes according to DIN-IEC 60751. The measurement block produces high-precision measurement of electrical resistance of the PRT and converts it by using the microcontroller of the measuring-calculating block to the temperature value according to ITS–90 with a resolution of 0,00001 K. Accuracy of temperature measurements in measuring block is about 0,002 K. The absolute error of PRT gives the main contribution to the total error of the temperature measurement. During governmental certification tests was established, that the absolute temperature measurement accuracy at the temperature 298.15 K does not exceed 0,03 K. The calibration of calorimeter was performed using the certified standard sample of benzoic acid (VNIIMS, Saint-Peterburg). Thus, the relative error of the bomb calorimeter BIC 100 obtained by ratio of the energy equivalent uncertainty (represents the standard deviation of the mean) to the energy equivalent (multiplied by 100 %) was ± 0,01 %, what corresponds to the level of modern recognized bomb calorimeters.