The smart multi-functional themisalpha index for diaphragm gas meters provides features, which go well beyond simple remote reading. The combination of existing options (time- and load-dependent tariffs, valve control, load profiles, communications interval control, data logging, etc.) enables the index to be adjusted to suit the needs of individual customers.A wide range of communications solutions for the themis-alpha index guarantee the authenticity and integrity of the data transferred between the communications partners and also allow granting authorization to users. A secure, remotely controlled software update and the modular principle guarantee that the technology is future-proof and also that it can be adjusted to meet new challenges retrospectively at low cost if necessary.