Yadda ake duba vaccine vial monitor (VVM)
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Bidiyo Masu Dangataka
Abubuwan amfani

VVMs suna baiwa ma'aikatan lafiya hanya mai sauki da sauri don fayyace ko an bar allurar rigakafi cikin matsanancin zafi - kuma da alamar ta lalace - inda za a jefar da ita.