periodic calibration of various machines / equipments used for testing at municipal material testing laboratory, worli- cbr machine-proving ring 50 kn for lab cbr test on gsb ( with mould & rammer cbr machine-proving ring 30 kn ( baker make ) for cbr test on soil providing ring 2.5 kn for direct shear test elongation gauge ( length gauge ) flakiness gauge ( thickness gauge ) los angeles abrasion testing machine automatic compactor i.s. sieve ( 75 mic to 80 mm ) series core cutter sand replacement mould digital hot air oven small hot air oven automatic sieve shaker weighing balance ( 250 gm to 50 kg ) aggregate impact value aggregate crushing value density bucket 3 ltr density bucket 15 ltr core cutter - 150 mm proctor mould -100 mm cbr mould proctor mould -150 mm stop watch marshal stability apparatus ( proving ring 25 kn & flow meter ) ( including mould & rammer ) digital marshal stability apparatus ( including lvdt, mould & rammer ) bitumen extractor manual operated hardness tester digital sieve shaker ( timer ) manual sieve shaker ring & ball apparatus standard penetrometer digital viscometer tar viscometer constant temp water bath apparatus 60°c constant temp water bath apparatus 25°c ductility test apparatus flash & fire point apparatus thin film oven hot air oven i.s. sieve ( 75 mic to 37.5 mm ) series digital thermometer thermometer weighing balance marshal moulds rete section universal testing machine compression testing machine flexure testing machine vibrating machine abrasion testing machine digital hot air oven vernier calliper ( 0 to 300 mm ) least count 0.02 mm thermometer cement mortar mixer it saves the device water bath weighing balance ( 100 kg ) cement mould bucket weighing balance stout