DescriptionBrand Name : OaueeOrigin : Mainland ChinaTheory : Temperature SensorModel Number : Magnetic Gas Cylinder ToolMax Measuring Temperature : 49C & UnderDisplay Type : AnalogCertification : NoneStyle : HandheldUsage : IndoorPower Type : NoneDisplay Size : 1.9 Inches & UnderIs Smart Device : NODescription:Never run out of Gas from now on. Measure your Gas with this level indicator, simply attach it to your gas tank cylinder with this magnetic Gas Level Indicator and it will show you how much gas is left in your tank.Material: PET Plastic+ Liquid Crystal + Soft MagneticColor: BlackFeatures:This product can safely and accurately measure the gas capacity, according to the gas temperature test, measuring the temperature range of -10 C~ 120 C.Will actually show you when you are low on gas, before you run out Works while you are using the BBQSave money by using more gas from each cylinderSafe & accurateReusableWorks on LPG (propane) & butane cylindersMagnetic backing allows for easy reuse on exchange bottlesComes with instructionInstructions:1.Place your Gas Level Indicator on a clean area on the lower half of the cylinder.2.Turn on the gas and wait 10 minutes before you can read your Indicator.3.In the winter the bar on the left will be active, and in the summer the bar on the right will be active.Working principle:the temperature of the upper gas is high, and the temperature of the lower gas is low. Depending on the color segmentation of the product, the position of the boundary line is where the gas is located.When testing the product, test it with the gas bottle open and test it while using it.Because this product is used to test whether the gas is used up or not, the product is attached to the bottom of the bottle and can only be measured when the gas is running out.If the gas is above the test card, the test result is wrong, the buyer can put a few sheets of the product on the gas bottle.Note:1.Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank