Offers Up to 50% off DynaKars All DynaKars are currently 50% off and DynaKar bundles are 30& off. Logbook ML Datalogger Buy 5 or more Logbook ML dataloggers and get a 25% discount. Use coupon code ml2545. Teaching Bundles Take advantage of our teaching kits designed to offer class sets at a reduced cost. Click here to view.