Highly accurate inductance meter for free

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Download and install this app on Android phone:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://play.google.com/store/apps/details%3Fid%3Dru.yukhlin.lcrmeterdemo%26hl%3Den%26gl%3DUS%26auao%3Dfalse%26referrer%3Dutm_source%253Dgoogle%2526utm_medium%253Dorganic%2526utm_term%253Dlcr%2Bmeter%2Bdemo%26pcampaignid%3DAPPU_1_cBn0YbriEuyawbkPpeWm2AY&ved=2ahUKEwi62qfJ7tT1AhVsTTABHaWyCWsQ5YQBegQIEBAC&usg=AOvVaw220ty0kDIU_60nUDl3Kv4y

This is demo version which can only measure complex impedance from 100 ohms to 10k ohms, however there is an easy way to get around this:

Step 2: build the test jig as indicated (very easy)

Step 3: connect a 300 ohm resistor in series with the coil to be measured and set scale on app to 10khz measurement frequency. That's it. Now you can measure inductance from 1 uH to 1mH no problems. Which is good when making coils for pulse metal detector.

It is extremely accurate. I verified this.

For measurements from 1mH to 10mH remove 300 ohm resistor.

It works very good.

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By putting a 300 ohm resistor in series, the software thinks it is measuring a resistor, but also displays the inductive component of the vector analysis algorithm computation. That turns out to be precisely the value of your coil under test.