Does anybody know how this meter can work without batteries? Without an electric current?
200502
I think it just senses the moisture. I know it works because when I put it in dry soil it doesn't move and when the soil is wet it does. That's all I can tell you. it does work.
200503
The answer actually shows up in the first review on Amazon for this product. What happens is that the two different metals of the probe, along with the moisture in the soil, create an electric current. It's called an "Earth Battery". If you look up "Earth Battery" using ether Google or Youtube you can find out more about it if you wish.
707083
I don't know. How would I find out without some sort of voltmeter? (Is this info possibly on the website specs?)
353901
How did you try to measure 24 volts? If you used 2 twelve volt batteries in series make sure they were connected one + lead to the other - lead. Or try to measure 3 nine volt batteries snapped together. You should get 27 volts. I think there is a calibration pot on the back of the meter. It is very small and you will need a jewelers screwdriver to adjust it. Make sure the red lead goes to the + termingal of the battery. Try again and let me know. You could have a bad batch of meters. Mine worked very will on my power supply that goes up to 27 volts. One last thing...are the 24 volt batteries you are measuring good batteries? The meter might be telling you that they are not. Hope this was useful. Also be aware that all meters have a percentage of error. Some are + - .1% + - .01%. No matter how expensive the meter it will have error tho very small. The smaller the error, the larger the price. These cheap but beautiful meters are good enough for battery monitoring. I wouldnt use them to build a computer power supply.
603197
Yes, that will work. The meter reading will indicate the value of the power source voltage. Instant battery voltmeter if that's what you want.
911095
Are you asking how much current this meter requires to work? If so I wouldnt imagine very much at all though I dont have a definite number. Putting a resistor in series with the meter would affect the voltage reading. What exactly are you trying to do?
1283490
I don't have a current meter on this but it would not work with my car or a 1amp power supply I have. It did work when connected to the 12v accessory plug (cigarette lighter) in my truck and boat.
56467
It is not connected to anything on the board. While in use I get nothing on my meter.
252362
It doesn't take any batteries..........it's an inverter. It takes input 24v DC power and inverts it into 120v AC power.
1408570
AC current only. Also, it's only an averaging meter. You need a true RMS meter with a clamp capable of measuring DC.
615020
It should work without you buying batteries. There is no battery to install. Did you press the "on" button? If it does not come up 000, you have a faulty water tester. Send it back.
1026024
Same here. I think it is the auto-ranging function. Turn off the auto-ranging and it should settle down. I have zero variability when set to volts range. Given the price of the meter I decided not to worry about this glitch.
2237049
The meter's box is held together by screws, so unscrew them to take it apart and then change the battery. There are no "battery doors" to access the battery, but I understand that the meter works a very long time on one battery - many years I would bet. There is no on/off switch on the meter because the moisture in the soil acts as the switch to engage the circuitry. A leaking battery would be the only issue, and that should not be as much of a problem if you keep the meter in a climate controlled enviroment (do not leave it in a hot or cold area like an unheated garage or shed). Hope this helps
997065
Try fresh set of batteries as 1st step-What makes u think meter not working?
1163071
No batteries needed and yes it is accurate. I have a digital one as well and they both read the same temp
658324
No, it does not need batteries. I assume it operates on the current from the batteries being tested. They warm you to not prolong testing of a battery as it can run the battery down. It takes just a split second to get a reading.
316834
I don't have a current clamp for my multimeter to measure it, nor the schematics of the device to assess whether or not it it would draw any current. If I lost any electrons then I would be positive!
839004
This meter came with two AA batteries included, and a spare F1A-250 amp fuse next to the battery holder.You will need to purchase a 9 volt battery, as the meter will not function without it.