Lubrication monitoring system

A lubrication monitoring arrangement configured to monitor a supply of lubricant in a hand-held cutting tool having a cutting unit, a lubricant tank and a conduit configured to duct a flow of lubricant from the tank to the cutting unit, wherein the lubrication monitoring arrangement comprises a heating element and a sensor arrangement, the heating element being configured to heat said flow, wherein the sensor arrangement comprises a first sensor located at said flow, upstream of the heating element, and a second sensor located at said flow, downstream of the heating element, wherein the lubrication monitoring arrangement outputs a monitoring signal based on a sensed temperature difference between the first and the second sensor, and

• wherein the lubrication monitoring arrangement comprises a sensor container forming a lubricant flow channel from an input to an output and a circuit board fitted inside the sensor container and carrying said heating element and said first and second sensors, reaching into the flow channel.