Tachometer testo 465 measuring range to 99 999/min incl. reflex marks, practical case Visual, non-contact speed measurement using reflex marks. Min/max function. Auto-off function. Technical specifications: Range to 99 999 rpm Distance to object measured max. 350 mm (14 inch) Auto-off function 30 sec (average/max./last readings are stored) Dimensions (L x W x D) 144 x 58 x 20 mm Weight 145 g Delivery incl. meter with reflex marks and batteries (2 x Mignon 1.5 V) in a practical case.