Triple Variable Tube Holder Kit, 6 x 70mm Back Catalog number: 800230 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 103SD Sulphur Dioxide 1-60 ppm Gas Detector Tube, pk/10 Price on request 800071-10 Tube Holder Housing End, 5/8", for 1/4" OD, Open End (Packg of 10) Price on request 800064 Tube Holder Housing End, 5/8", for 7-10mm Price on request