Curtis Industries Sensitivity calibration block – SC Curtis industries| 4157 Curtis Industries Sensitivity calibration block – SC Print Curtis industries| 4157 Cuertis Industries Sensitivity calibration block – SC QXX-5006 SC block, carbon steel 1018, with wood case. QXX-5006A SC block, 7075-T6 aluminum, with wood case. QXX-5008 SC block, 304 stainless, with wood case. Request for information