bids are invited for diesel engine spares 4g11t & 6g11t total quantity : 277; rotary tell tale: 1. single point rotary tell tale for measuring roof movement in underground coal mines. 2. the spring shall be of sufficient tension to hold anchor while being inserted in the drill hole. 3. flexible wire length-5 meter. 4. it shall have an anchor to hold the hole and shall have a circular disc type scale attached to it. 5. disc range shall be marking as: 0-5mm-green, 5-10mm-yellow & 10-25mm-red with 1 mm graduation 2 telescopic convergence rod/indicator: 1. range of measurement shall be 2.0 m -4.0 m. 2. scales shall be graduated with 1 mm least count by etching operation from 0.0mm-1500.00 mm minimum. 3. it shall be rust proof and rugged in design of ss square pipes. 3 single point auto warning tell tale: single point auto warning tell-tale. with 6 meters anchoring wire length and triggering level of 5mm (adjustable) having visual led warning system for measurement of deformation in roof layers of underground coal mine. intrinsically safe certified by cmri dhanbad and confirm to all parameters and guidelines laid down in dgms technical circular number dgms/s&t/tech circular (approved) no.15 dated 4-6-2015. and bis no.cm/l-9300040008 as per is/iec 60079: part ii: 2006. having the following specifications: a. no. of anchor points - 1 b. anchoring height - 5 c. length of bore hole - 6.5 mtr. d. bore hole dia-40-42 mm. e. visual indication - led display f. triggering level - 5 mm (adjustable) g. water proof- water proof design