Compound water meter MWN/JS or JM or WS or WM. consists of a main water meter of MWN type described above and an auxiliary water meter. Multi jet wet type vane wheel WM water meter may be installed as an auxiliary water meter. The division of flow through the auxiliary water meter (small flows) or the main water meter (large flows), regarding the flow volume, is controlled by the spring switching valve. Action of this valve is automatic and does not require any external energy source. As a result of the valve operation the measurement ranges of main and auxiliary water meters penetrate each other, similarly the compound water meter has a very large measurement range, from the minimum flow volume of the auxiliary water meter to the maximum jet flow volume of the main water meter.