Features: Ultrasonic?range?finder?is?fully?applicable?to?home?decoration，?buy?air?conditioning?calculation?area?of?volume，?real?estate?agents?or?construction?workers?must，?need?fast?measurement?tool?room?and?room?area，?ultrasonic?range?finder?capable?of?measuring?linear?distance?from?0.50M?to?18M.?(1.5?feet?-60?feet)?is?the?use?of?ultrasonic?waves?ultrasonic?distance?to?the?object，?and?then?calculate?the?round?trip?time?ultrasound?to?determine?the?measurement?distance. Specifications Measuring?range:?50?cm?to?18?m Resolution:?0.01?m Maximum?measurement?distance:?18?meters And?the?maximum?distance:?180.00?m And?the?maximum?distance:?180.00?m Maximum?volume?calculation:?1800.0?cubic?meters Power:?9v?battery Transmission?frequency:?40kHz Operating?temperature:?0?°?C?~?43?°?C Size;?approx?15x?5x?3cm Color:?red Net?weight:?91g Rangefinder?Instructions: Warning:?If?you?are?not?more?than?a?month?or?a?month，?please?remove?the?battery?to?avoid?battery?long?time?without?leakage?damaged?instruments. Usage: Rangefinder?switches: To?open?this?instrument，?please?press?"MEASURER"?Even?in?the?dim?light?can?easily?display?screen. 30?seconds?if?you?do?not?shut?down?automatically. Measurements: 1.?Click?on?the?"MEASURE"，?this?instrument?will?measure?radar?instrument?reaches?the?other?end?to?be?measured. 2.?Make?the?bottom?of?the?instrument?close?to?the?wall，?probably?from?the?ceiling?to?the?floor.?Make?sure?there?are?no?obstacles?between?you?measure?the?distance，?your?head?or?your?hands?do?not?in?front?of?the?measurement?instrument. 3.?Repeat?Press?"FEET"?or?"METER"，?"FEET"?expressed?in?feet?measured，?or?the?emergence?of?"METER"?indicates?measured?in?meters. Explanation: Meter?display?is?generally?about?30?seconds，?if?you?change?to?another?mode?is?about?30?seconds. If?you?measure?a?range?of?less?than?2?feet?(0.5?meters)?or?greater?than?60?feet?(18.288?meters)?will?show?"ERROR" Measurement?tips: Some?curtain?can?absorb?sound?waves，?resulting?in?Measurement?are?not?allowed.?If?you?have?curtains?indoor?measurements，?please?first?the?curtain?into?the?window?on?the?other?side，?but?also?to?close?the?window. If?there?is?an?obstacle?in?the?distance?measurement，?then?the?ultrasonic?measured?data?is?incorrect，?for?example?tables，?chairs，?or?other?obstructions.?If?you?are?not?sure?you?are?measuring?is?correct，?then?you?make?multiple?measurements?from?different?angles. If?it?is?not?where?you?are?measuring?flat?or?very?narrow?corner，?then?you?come?to?the?data?that?is?in?error. If?you?want?to?measure?a?distance?greater?than?60?feet?(18.288?meters)?then?choose?the?house?in?the?middle?of?the?point，?for?example:?measuring?from?point?to?each?side，?then?add?it. Laser?function.?Reducing?errors: 1.?Follow?these?steps?to?use?the?"measure"?to?measure?a?size In?the?memory?card?M1，?M2?or?M3?card?data?storage?2.?Click?"STORE"?button，?you?will?be?able?to?measure?the?inside. 3.?If?necessary，?repeat?the?above?first?and?second?steps?to?store?data. 4.?If?you?want?the?data?stored?in?what??Deceive?M1，?M2?or?M3?card.?So?that?data?exist?inside. 5.?If?you?want?to?store?the?new?data，?then?it?directly?to?the?original?data?can?be?deleted. 6.?If?you?want?to?delete?all?the?data，?then?it?would?press?"ALL?MEMORY?CLEAR"?hold?for?3?seconds，?and?then?there?are?M1，?M2，?M3?and?the?like?all?of?the?data?will?be?temporarily?lost. Note:?After?you?delete?date?and?sound?can?not?be?saved Laser: To?use?the?laser，?press?the?"LASER"，?if?you?do?not?move?for?5?seconds，?then?will?automatically?shut?down Note: 650?nm?laser?emission?of?visible?laser?wavelength. Do?not?stare?at?the?laser?beam?to?see，?do?not?use?the?laser?shoot?anyone's?eye Package?Includes: 1?x?Distance?measurer 1?x?Manual