Length: 17.5cm x Width: 16cm x Height: 5cm
Metal gauge with glass cover. There are numbers around the face of the gauge from 0-500 in increments of 50. There is a movable metal arrow in the centre. The manufacturers information is on the face of the gauge, "TEST GAUGE 023-352416 SINGLE SPRING THE JAS. MORRISON BRASS MFG.CO.LTD. TORONTO". There is a small threaded pipe coming out the bottom of the of the gauge.