tender for 1. rebar locator 2. for ultrasonic pulse velocity (upv) tester: (a) 54 khz exponential transducers (b) 24 khz transducers , rebar locator , rebar locator rebar cover measurement measurement mode: spot measurement measuring depth: - 185 mm depending on bar size & spacing accuracy: +/- 1 mm the equipment should automatically detect the cover depth while locating the rebar rebar diameter measurement the equipment should have function for rebar diameter estimation measurement depth: ≥ 60 mm accuracy: +/- 1 mm display & image processing the equipment should have a high-contrast oled screen or better the equipment should provide correction for the neighboring rebars (at least for the rebars situated in the first layer). power supply the equipment must operate with flight safe rechargeable batteries accessories required rebar locator/cover meter, rechargeable batteries, battery charger, chalk, carrying case and strap, etc. warranty requirements: warranty period: minimum one year , for ultrasonic pulse velocity (upv) tester: , a) 54 khz exponential transducers type - single-crystal ultrasonic exponential transducer nominal frequency - 54 khz frequency tolerance - ± 5 khz bandwidth - 10 khz driving voltage range - -1000 v to +1000 v matching inductance - absent piezoelectric cell capacitance - 2 nf connector type - bnc operating temperature range - -20 °c to +60 °c contact surface diameter - 4 mm overall diameter - 49.7 mm weight - approximately 244 g , b) 24 khz transducers type - single-crystal transducer nominal frequency - 24 khz frequency tolerance - ± 5 khz bandwidth - 5 khz driving voltage range - -1000 v to +1000 v matching inductance - absent piezoelectric cell capacitance - 450 providing fixing connector type - bnc operating temperature range - -20 °c to +60 °c contact surface diameter - 50 mm overall diameter - 50 mm weight - approximately 1325 g