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Hi gourav, It sounds like you want a numeric Meta point something like this... //valve is the boolean point controlling the valve, updating ontext, logging on change //total is the numeric point measuring the weight in the vessel if(valve.value || my.time > valve.lastValue().time) return "no value"; //we'll not be logging here... set data type exception to ignore! //Okay, valve just closed var values = valve.last(2); var difference = total.value - total.pointValueBefore(values[1].time).value; return my.vaiue + difference;