actually it let me know what any fluke , megger , or other high priced insulation tester would...if the device was bad, going bad or good...it told me what any other quality megger would....for a great price, really love the compact size, easily carried with me as a tech, perfect for the smaller controlsystems I deal with.

Worked well. Instructions were in English but not stellar. Really burns through the 9 volt quickly.

I will paste the output from the android app "Google translate" below. It is a word for word translation with no english grammar rules applied. I can only guarantee that it isn't a perfect translation. Use it at your own risk after applying common sense. If you have questions or concerns, download the app and scan the manual.BM500 / BM500A digital insulation resistance meter (megger) Manual SzlBJ Shenzhen Binjiang Electronic Technology Co., Ltd.I. Overview welcome to use this product!BM500 digital insulation tester output 100V / 250V / 500V three voltage, BN15 00A output of 250 V / 500V / 1000V three voltage measurement range of 0.001 ~ 1999 M. Circuit is designed as a low-power, high efficiency type, using 6F22 battery, 500V range measuring 1.5MΩ resistor, if each measurement period is five seconds faint, continuous measurement of more than 200 times, the product is suitable for measuring transformers, motors , cables, switches, appliances and other electrical equipment and insulation materials insulation resistance, a variety of electrical equipment maintenance, testing and verification.Its structure is compact, easy to carry, is your ideal electrical test instruments.II. Safety Precautions(1), safety Symbol:warning,be careful!A, high voltage electric shock hazard!Back double insulation protection.Should read the instructions carefully before (2).(3) The rear cover is not prohibited the use of front cover, otherwise risk of electric shock(4) should be checked leads insulation intact prior to use, no damage(5) To avoid electric shock, do not touch the test when the test leads and test head circuit(6) before the test make sure the range selector switch has been set at an appropriate voltage range(7) to determine the wire connector plug is tightly inserted into the terminals.(8) the instrument in a wet state, do not use(9) Do LED is illuminated (with high voltage output), turn the range selector switch(10) Do not test flammable environments, sparks could cause an explosion(11 ) The instrument is in use, the cabinet or the test line breakage caused by the metal exposed, stop using(12) to open the instrument back cover and replace the battery, make sure the test leads removed from the test terminals, range switch to the OFF position(13) After use, be sure to range selector switch to the OFF position(14) unused for long periods, remove the batteries to avoid battery leakage, damage to components.When (15) instrument display, "white", the battery should be replaced to ensure the accuracy of measurementThird, Properties3.1 General characteristics over range indication "I"(1), low power double integral A / D conversion integrated circuit.(2) - Display: LCD; Maximum display: 1999;(3), the data hold function;,(4)LED light indicates the measurement status;(5) The low-battery indication: Display "E";(6), battery-powered, no Dynamo;(7). Wide measuring range 0.001 ~ 1999MS, automatic conversion range;(8). Load capacity, 500V / 100OV files larger than 2mA short-circuit output current.(9)Working environment: 0 ℃ -40 ℃, less than 75% RH(10), the storage environment: -10 ℃ -60 ℃, less than 80% RH(11). Power: 9v battery (IEC6F22, NEDA 1604. Ⅱ S006P or equivalent type)(12)Dimensions: 138 (L) X69 (width) x31 (height) mm(13), Weight: about 170 grams (with battery)3.2 Technical characteristicsAccuracy: ±% of reading ± words guarantee period of one year to ensure the accuracy of the environment: 23 ℃ ± 5 ℃, 70% RHRated voltage 100V / 250V / 500V / 1000Vminimum differentiate force! 0.001- 1999M Ω 0.001 MΩmeasurement accuracy 1 ± 3% of reading ± 5 wordsTo ensure output - fit small measured resistance pressure accuracy100V file: about 300k Ω250V file: about 500kΩ500V file: about 1.5MΩ1000V file: about 5MΩIV. Use 4.1 Panel (see Figure)(1) LCD(2) Data Hold button HOLD, display "H" when locked.(3) the range selector switch: used to select the function range.(4) L (LINE) input (line-side connection of the measured object).(5) G input terminal (screen)(6) E (EARTH) Jun input of the measured object to end)(7) high-voltage start and stop button TEST / STOP(8) high-voltage work light4.2 Operating Instructions1 Safety precautions1) Carefully high voltage electric shock. When the insulation resistance test is completed, confirm the high pressure on the already tested object is discharged.2) During the measurement, do not touch the object to be measured, small heart high voltage electric shock3), measure the insulation resistance, the measured object should not be charged, and confirm the measured object safe ground before testing the test object should be made between short-circuit discharge test AN4) measure the insulation resistance, do not let the outside world voltage added to the test circuit.5) before the start of the test, make sure the connection range switch R position and the test line is tight.6) When the high pressure switch is pressed, the output terminal and the E terminal between L 100V to 1000V (depending on the type and position) pressure, then do not touch the exposed portion of the dragon and the object of the instrument, or there will be a shock Danger.Insulation resistance test 21) test terminal connection of the plug with the red test lead into the meter L catching end socket that will take a red test clip of test cord plug into an instrument of the E terminal socket, the black belt test test clip G end catching seat cord plug into the instrument, are connected.2) Test the connection meter E end socket connection (red test clip) is the ground wire; L side meter socket connection (red test lead) for the Line of; meter G terminal socket connection (black test) shielded cable; then object to be measured on the surface, to prevent surface leakage effects test impedance.3) Rated voltage rated voltage of your choice to select insulation resistance testing needs, set the range switch knob to the appropriate voltage profile.4) The test bar leads to the other end of the test object. Press the high-voltage switch (TEST / STOP), this time, the red indicator light, said the test voltage output has been turned on. After the start of the test after the start of the test, the meter reading was displayed there, that is the value of its display is insulation insulation resistance value of the measured object. Value5) off after the test is completed, the release of high-voltage switch (TEST / STOP), the red indicator turns, indicates the high voltage output has been disconnected. Halo drive the rotary switch to the OFF position, LCD liquid crystal screen, no display. Capacitive load, but also the first object to be measured on the residual charge discharge is completed, in order to prevent the residual charge discharging hurt, and then remove the test leads, completed6) Statement: If the measurement error, can cause personal injury as well as storage instrument failure. Please familiar with the user manual, in the case of fully understand the contents of the operation. In case there is an accident, caused by our company, and will not be responsible.Five meter maintenance Warning! Before opening the case or battery cover, turn off the power and disconnect the test leads to avoid electric shock.1 When the instrument displays "song" symbol, replace the batteries. Fight Open the battery cover, put a new 9V battery, in order to ensure the normal operation of the table to keep the meter and Table 2 pen clean. Drying and non-destructive, use a clean cloth or detergent to clean the case, do not use 3 to avoid mechanical damage effect abrasives or solvents, vibration, shock, avoid exposure to high temperatures and strong magnetic field in the six position.Annex 1 test line set 21, a 3 instruction manual. Certificate, warranty card VII Appendix insulation resistance tester in use should pay attention to several issues(a), Introduction The insulation resistance tester can determine motors, transformers, switchgear and electrical equipment coil and cable integrity For example: When testing electrical cables or switch equipment (low capacitance device), and time-dependent capacitive leakage current is not obvious, and will quickly drop to zero. In a short time (one minute or less) can achieve a stable amount of leakage current conduction for checks reading / short impedance test provides a good condition. On the other hand, Xiao long cable test equipment, large-scale horse Up or generator (high capacitive device), the time-dependent current will continue for several hours. These currents can cause the insulation resistance meter readings constantly changing, it is impossible to obtain an accurate and stable readings if you can read between the trend analysis, patients with known or dielectric absorption step voltage test, we can overcome this situation. This situation is not relying on a single readings, but depends on a number of related reading e due to low capacitance device testing, time-related current drops quickly, the results of several tests are the same, so the use of this The method would be a waste of time.(B), the most important reason for assembling test insulation test is to ensure public and personal safety. Through the high voltage DC testing of fire, earth and ground conductor, you can exclude the phenomenon of short circuit or grounding life-threatening. Usually finish after the initial installation of equipment for such tests This test system capable of preventing wiring errors and defective equipment to ensure the quality of the installation, to prevent a fire or explosion.(C) Maintenance is another important reason to test insulation test is to protect and extend the work of the electrical system and motor cycle electrical system the year by the impact of dust, grease, temperature, stress, vibration, and other factors, these conditions are likely to deteriorate the insulation, causing production losses, and even fire regular maintenance tests can provide valuable information on the state of the system loss, help predict the possibility of system failure.Timely Solve problems, not only to ensure the system's long trouble-free operation, and effectively extend the period of operation of various devices.1 Before measuring insulation resistance measurement edge obtaining meaningful, carefully check the electrical LINe IF test system meets the female condition, will get the best measurement results: a system or device to stop running and all other circuit gates, capacitors, brush, lightning and circuit breakers to ensure that the test is not affected by the switch off rent overcurrent protection device leakage current through ft.2, ambient air temperature is higher than the dew point cal result does not meet this point, the surface will be formed in the insulating layer of mist, but also long been absorbed into the insulating material under fife situation.3. Conductor surface carbon ink and it can not exist it is easy to form in wet environments impurity conductor4. The applied voltage is not too high, when the test system low jade pull inch, high voltage will cause overload or damage to the insulation. ,5. Test system to fully discharge grounding discharge time is should approximately five times the charging time.6. The effect of temperature is worth noting that, since the temperature is inversely proportional to the insulation resistance and insulation materials were (the higher the temperature, the more impedance, impedance recorded temperature readings will be changed insulating material RE) were measured under measuring R. , According to press see recommendations according to practices at 20 ℃ (687) standard temperature temperature, the resulting readings or 20 ℃ temperatures were compared Representing, in the above 20 ℃, the temperature is increased 10 ℃ (18 F), then the impedance value 20 ℃ lower readings will be twice; at 20 ℃, 20 ℃, under the less, the temperature is reduced by 10 ℃ (18 F) impedance will be half the value of reading, for example: at 40 ℃ impedance of 1MΩ, in terms of the impedance at 20 ℃, and its value is 4M10. Using non-contact infrared thermometer, measure temperature guide(D), job security to ensure safety is everyone's responsibility, but only you hold, no tools to ensure your safety. Only equipment and safe work habits combine to provide the most secure protection for you, here are some safety tips that should be followed:★ Whenever possible, try to make the work circuit in a non-energized state to take appropriate cutting / off step, add fruit such state of uncertainty, it is assumed that the circuit is energized.★ for energized circuits, the use of protective devices: Use insulated tools, wearing fire suits, goggles, insulated gloves, remove F table or other decorations, stood an insulating mat★ draw old electrician experience: holding a hand does not and other material. This will reduce the closed-loop current through the chest and the heart of the machine ★ when the insulation resistance test:※ Do not use insulation tester is connected to the conductor, or power Equipment, and follow the manufacturer's recommendations for testing※ fuse, gates, and the circuit breaker is open, the measured device off.※ wire branch circuits, grounded wire, ground wire and other equipment is disconnected from the device under test.※ before and after the test, the test object must be on the capacitor discharge. Some devices may have automatic discharge power dragon.※ Check the fuse through the circuit breaker, gates and discharge circuit on the current leaks, leakage currents can cause erroneous test results※ When the poor insulation, the device will generate an arc so, do not dangerous, explosive air environment By using an insulation tester.※ When connecting test leads to the use of insulated rubber gloves.(V) Important insulation resistance tester measures the resistance value measured a decent side, but lli point of resistance value, so the wire can not be connected to the non-conductive object (such as a cable rubber, plastic) surface, The need to use a conductive material cai tin parked paper) to stick to the surface of the object, and then the wire connected to the conductive surface, it can be measured

Excelent device, very helpfull and the Price is excelent

Excellent and cheap insulation resistance meter., know as a "Megger" the main use a person would have is to test the insulation on coaxial cable. I am a hamradio operator and being able to test coaxial feed line is very handy indeed conventional VOM, and DMM's will not give an indication of insulation resistance. What this will show you is if you have coaxial cable with a wet core. Unlike the cranked "Meggers" this instrument will not destroy what you are testing, it tests at up to 1000 volts but is has crowbar sensors that cut it off before their is damage if what you are testing is really bad, it is powered by a 9VDC battery so there is not much current to damage anything to begin with. This is an instrument that, to be honest, is not one you will use very often but as is often said; "there is no such thing as too much test equipment".The manual for this meter is in Chinese however there are several English language manuals on line just put Google "manual for Estone. insulation tester and you will find what you need.

I need instructions in English on how to use it properly. Nice price.Comments posted by Richard J. Kemmerer

Not good directions

I just want to inform future customers purchase this item. It doesn't come with an instruction sheet written in English. I attempted to use the FTP protocol with the link provided however I was unable to get past the login and password requirement to get to the manual. Hopefully, if you purchase this item, you will have better luck than I did or already know how to use this equipment.