GPS measurements acres instrument originally export products, quality, reliability is no ordinary factory comparable, we have absolute confidence in the product. Measuring special version uses GPS module manufacturer in Taiwan customized, not ordinary navigation with GPS module! By ten million microwave darkroom assessment and commissioning, to ensure high performance GPS. Than afraid, afraid than! GPS area measurement instrument to provide "seven days no reason to refund"! Recommends that manufacturers require customers to compare different products, can be purchased at the same time be able to provide two sets of "seven days no reason to refund" manufacturers of different goods and services, to try to get to the fields, comparison, drained away satisfied with the product. No Alipay friends, providing direct bank transfer or cash on delivery service. Product Standard configuration: host, lithium battery, charger, manual, warranty card, boxed. Frequently Asked Questions: 1. What area of ??precision? 1-3 acres: error ± 0.1 acres. 3 acres or more: error ± 2%. Note: SV-118 is the only market to do a small area measuring instrument acres ± 0.05 acres of error, in extreme cases not exceed ± 0.1 acres at 3000 yuan accuracy within an area measuring instrument, far more than similar products. Tips: Almost all of the market measured acres instrument manufacturers are nominal accuracy of 0.1 acres, and according to our actual test, the vast majority of products using inexpensive GPS navigation module, 1-3 acres of measurement error of up to 0.5 acres or 0.8 acres. Purchase must ask the seller promises "an accuracy of less than unconditional refund!" 2, ranging accuracy how? 1000 m: error of 2-3 meters; even meet most of the requirements of engineering ranging accuracy. 3. What area of ??the unit, one mu equals how many meters? Measurement results can be displayed simultaneously acres and square, through the up and down keys to switch the display units. 1 mu = *** square meters, the user can arbitrarily set and modify the parameters of the menu for easy measurement standards in different regions. 4, can be measured slope or hilly area it? Can. Test out the projected area of ??sloping or hilly, the projected area of ??the agricultural sector in general is actually a small sloping or hilly area of ??computing time is used. If the slope is particularly large, such as greater than 45 degrees, it can be estimated by calculation. 5, your navigation module or measured using specific modules, charge? SV-118 from Taiwan custom precision measurement dedicated GPS module, not the low-precision GPS navigation module; always free. 6, long standby time, you can directly charge it? Measured over 24 hours continuous standby time, fully charged one week to meet the needs of agricultural operations fee; direct charging, random with a charger, optional lithium battery. 7, I saw some measuring instrument can also navigate, you can add navigation features? Within our industry, with GPS navigation software installed as an area measuring instrument is a joke, is completely hoodwinked consumers. A, because Navigator uses inexpensive GPS navigation module, opened the car's friends all know, navigation accuracy is low, opened an intersection sometimes can not recognize, do not have any measurement accuracy at all. B, SV-118 from Taiwan custom precision measurement dedicated GPS module, not cheap low-precision GPS navigation module! 8, there is warranty? One year warranty, the network purchase for 13 months warranty; lifetime maintenance (only charge the cost). 9, bought not satisfied you can return it? 7 days no reason returned! Mainly the precision, from shipping Sifa electronic bear very welcome comparison test. 10, see a product and you look very similar, the big difference? Has been imitated, never surpassed! Putting aside the accuracy, a little contrast, you will find the basic functions and operations are completely different, and some are not even the menu functions. Please discernment: Sifa electronic design teams in the GPS industry for more than ten years experience in the design, not the general manufacturers can imitate recommended contrast use and testing, not to return, and who clearly inform sellers and contrast!