MOISTURE METER – use the handy Valiant Moisture meter to ensure you get the best burn from your fuel. Our newest model not only has a backlight screen to illuminate the reading but the built-in colour change technology indicates the moisture level of the firewood. It’s an essential tool for any fireplace owner! Fuel quality is the single most important aspect of making a successful fire. To burn effectively the moisture content of firewood needs to be less than 20%, whether it’s being used in an open fire or a stove. Freshly felled timber can have a moisture content of between 30% and 60%, which when burnt can cause dangerous creosote build-up in chimneys.