NANOCOLOR® VARIO heating blocks An important step in photometric water analysis is the digestion of the sample obtained by heating. Available in different sizes for 6, 10, 12 or 24 test tubes. The VARIO HC heating block also has active cooling. Touchscreen with color display and self-explanatory icons is highly user-friendly. Fast heating with alarm when temperature is obtained. Delivered ready to use and with free updates online.