BT-6688B Megohmmeter 200 Gig Ohm Digital Insulation Resistance Tester, 500V/1kV/2.5kV/5kV Test Voltage, Auto Ranging, Backlight Display

I needed a megohmmeter when installing Ditra heated floors and came across this when looking for one. The unit is well built, easy to use and did exactly what I needed it to at a fair price

The first unit I ordered had a miss-fitting negative lead that simply rattled around in the socket. I returned that one and received a second unit at no additional charge. One of the included batteries was leaking and measured zero; additionally it produced intermittent readings. Amazon refunded me for the second unit but told me to keep it. I decided to see if I could repair it rather than re-ordering another. I took it apart and found a loose solder joint which I fixed. The unit now works perfectly. I purchased it in order to verify the resistance of some high-gigohm resistors; the meter confirms their rated values within 1%. I've also tested it against various insulation materials for resistance with good results. A very nice meter if you get one that works!

More than accurate enough for quick bench or field tests. Doesn't 'feel' as solid as my Fluke but is considerably less expensive and has a greater range of testing settings. Thick padding does a good job of protecting the actual meter. Provided test leads seem a little flimsy. Time will tell how they hold up for daily use. Only complaint: 5 days to process the order. Then actual shipping only took 2 days and was delivered on a Sunday even with the free shipping option. Unique combination of under/over achieving on the same order.

Don't rely on the instruction sheets that come with it. They do describe the basics: connections, control, etc. But the portion that describes insulation testing is poorly written, maybe suffering from translation fatigue. Better to tune into a YouTube of what you’ll be testing. That confusion (for me at least) aside, the megger does whats intended. And it ruggedly built, comes with needed cables and a case. User guide does need some work or at least a few staples to bind it together.

I purchased BTMETER BT-6688B tester to evaluate and compare insulation of Earthing Shoes. Its ranges 200Gig and 5kV are very critical to me. Other meters do not go so high or cost is too high for me. I like this model also because it has actual resistance reading instead of just LED light showing for example "resistance is between 10Meg and 100Meg" - this is not sufficient for me. I like meter's simplicity too, nothing fancy, no preparations. It has two side terminals for measuring resistance. Additional two terminals at the center allow measuring voltage. In order to check accuracy I purchased a few high value resistors. Due to cost I purchased only cheaper lower values 47Meg to 5Gig costing less than $5. With a quick test taking a few minutes I obtained following results: 47Meg 5% resistors read 44.9Meg and 45.3Meg 90Meg 1% resistor reads 89.1Meg 150Meg 1% resistor reads 147.5Meg 1Gig 1% resistor reads 0.979Gig 2Gig 1% resistor reads 1.97Gig 5Gig 1% resistor reads 4.97Gig I am very happy with test results. It seems all readings are slightly on low side, but this error is somewhat consistent and well within specification. Earthing Shoes and other shoes I used for comparison testing gave me readings much higher than 5Gig, some close to 200Gig and some exceeding maximum 200 Gig. GOOD - Meter is rather heavy, as it should be. - Easy to use, very heavy duty high voltage cables included. - All cable terminals located on back side. - Built in quality OK for such low cost meter. - Clear display, anti slippery housing great for outdoor testing. CONS - Some guide regarding best working voltage for given resistance range could be printed at the bottom or on front panel. - No information how long batteries last. Shall I carry a spare set just in case? Overall very nice, low cost tester reaching extreme 200 Gig Ohm and 5kV.

I work on Motors and this instrument works as well as the hand crank megger we've had for years and its more portable to carry in the field . It didn't break the Bank to buy one either . The Case is large and heavy and will stand up well in a Industrial sitting . Accuracy is good as well .

The product does appear to work well and for the cost vs. some of the other manufacturers (such as Fluke) it was an excellent price. However, be forewarned that the instructions in the box were clearly written by someone who does not understand English very well and are impossible to decipher. If you've never used a product like this before you will NOT be able to figure it out based on the instruction card.

Received the Megohmmeter and used it to run 1000v insulation testing on my radiant floor heat cable to extend my warranty. I just used it and it did the job as I’d hoped. The meter itself is big and a little on the heavy side but it does the job and it was simple to use.

双興の標準器で試験してみました。 試験結果は添付の通りです。 表の標準抵抗値が２グループあるのは 高圧用と低圧用の標準器を使用したからです。 電圧は、日置の高圧プローブとテスタ（校正済）で確認 本当に5000/2500/1000/500Ｖ（5000Vで100Ｖ500は20くらい低い） まぁまぁでてました。 5000V測定で 標準器の下限抵抗が 200MΩだったので それで確認測定したんですが 垂下特性は発動しませんでした（5000Ｖのまま） 電源容量は無さそうなので問題ないですね。 試験結果を見ていただければ、高圧ケーブルに使えないのは 分かると思いますが、片手で持てるので 機器側の測定するには楽そうです （写真のイメージよりは大きい） 横○（青い蓋のやつ）の高圧メガのように 測定コードが交差すると値がめちゃくちゃ下がります。 購入する方は、試験結果を参考にしていただければ嬉しいです。 ちなみに、仲間から ゴミだね！と言われました(笑) 私は使います。 ちなみに まだ現場で使用してないのに 静電気で保護カバーが真っ黒になりました。（昨日 到着したばかりの新品なのに） この価格で これだけできるので星５のような気もしますが 仕様を満たしてないので 星３としておきます。 わかって使えば問題ないですよね。