Left and right distance: 22.5-41 mm. Value error of 0.5 mm or less. Rounding error of 0.5 mm or less. Measurable monocular target distance: 30 cm. Automatic shutdown time: stop for about a minute.
Power supply: dc 6 v (4 AA batteries). We are not responsible for undeliverable address. If you are dissatisfied for any reason, please donot be quick to leave negative/neutral feedback. We work hard to make sure EVERY CUSTOMER 100% SATISFIED. If you have any special request, please kindly advise us once place order.We will be happy to assist you. We would try our best to serve you with any question / problem. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Handpieces & Instruments\Otoscopes & Ophthalmoscopes". The seller is "yonghon0*" and is located in this country: CN. This item can be shipped worldwide.