CarlThingy
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CarlThingy 09/10/2024
Nicely made unit, compact and sturdy seeming. Parts of the display are best suited to younger eyes (small), but the main reading is easy to read. Tiny GM tube ( J613 ) is not very sensitive, and being inside plastic screens out a lot of beta. This means it's not very sensitive for background readings. However, it also means that nearby sources give a more distinct reading. This tube has two wire leads at one end of the envelope. It's soldered into the board, and stuck down at the free end using double sided tape. In my one, the tape wasn't great and the tube had sprung away so it was only supported by the wires, and rattled in the case. This clearly won't do the wire to glass airtight bond any favours, so I re-stuck it using better adhesive tape (that black stuff used for LCD front glass etc,) Overall, for the same kind of price as the kits with no display, recommended.
Μετρητής Geiger FNIRSI GC-02 Δοκιμαστής πυρηνικής ακτινοβολίας Προσωπικός δοσίμετρος Μετρητής ακτινοβολίας X-ray γ-ray Δοκιμαστής ραδιενέργειας Δοκιμαστής μαρμάρων
US$49.99 US$69.99
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CarlThingy 01/12/2020
Quick delivery! I've only had this a few minutes, but my first impressions are very good. It seems solidly made, it's a good size, marginally slimmer than my regular DMM but about 15mm longer. Basic measurements compare OK against another DMM - I don't have a precision calibrated meter to hand but it seems to read very slightly lower for voltage, but it's a very small difference. Whether the bigger error is in my other meter or the Mustool is moot as far as I'm concerned; I didn't buy this as a precision voltage meter, I bought it for its versatility, and my main interest is its built-in oscilloscope function, of which I was skeptical, given the use of regular multimeter probes and that claims for pocket oscilloscopes usually seem to be exaggerated, sometimes wildly so. I haven't explored the extent to which it can live up to its "40MHz" claim - I'm expecting significant attenuation and distortion at that sort of frequency, but then I have a couple of bench oscilloscopes for that kind of thing. In the more practical realm of the modest frequencies seen in automotive or audio test, though, so far it's promising. I hooked it up to a microprocessor GPIO being toggled every 1ms and the trace on the Mustool was agreeably clean and square. I was also pleased that manually adjusting the time base, gain and trigger settings was less awkward than anticipated - a knob would be better than repeatedly stabbing a button, but the buttons work well enough. As others have said, max vertical sensitivity is quite limited at 0.5v per division. (The dots you see in the photos are the divisions in question). It claims an input impedance of 10MΩ. For higher-frequency signals, a suitably trimmed 1:10 probe should help, but the 0.5v/div won't often be enough at 1:10. I'll try to update this review with some photos comparing the waveform seen on this little thing with those on a bench 'scope, at some point, meanwhile, so far, this seems to work as advertised and to be very good value.
MUSTOOL MDS8207 Έξυπνο Αναλυτής-Oscilloscope 2 σε 1 Ψηφιακό 40MHz 200Msps/S 6000 Μέτρηση True RMS
US$69.99 US$109.99
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