bids are invited for metric surveying chains-is:1492 ( q3 ) , measuring tape ( q3 ) , surveying chain pins ( arrows ) -is:1842 ( q3 ) , spirit level ( q3 ) , geological compass ( q3 ) , hammers-is 841:1983 ( q4 ) , fixed tripod - surveying accessories ( q4 ) , magnetic compass ( q4 ) , laboratory drying oven ( q3 ) , flow table ( northern coalfields limited ) ( q3 ) , flexural testing apparatus of concrete - is 9399 ( q3 ) , ultrasonic pulse velocity tester ( q3 ) , test sieves - as per is 460 part 1 and part 2 ( q3 ) , digital spring testing machine ( q3 ) , trowel -as per is 6013 ( q4 ) , tensile testing machine ( q3 ) , scales ( steel scale ) as per is:1481 ( q4 ) , internal micrometeris:2966 ( q3 ) , folding type levelling staff-is:1779 ( q3 )