Testing cannot be carried out while the power is on. The pin marked on the device corresponds to pin 1 of the optocoupler, and press it from top to bottom. If the optocoupler pins are rusty or have glue, you can clean them a little in advance.
eBay
Reading display: 3-1/2 digit display. Sound&Light Alarm: When the detected data beyond the safety value, it will emit sound and light to alarm you. Size:152 52 26.5mm (5.98 2.05 1.04in). 3-in-1 Function: This tester combining three testing functions on machine, it can detect the electric field, magnetics field radiation and temperature for you.
eBay
UIG Watch is the first nanotechnology-powered invention patent. The UIG Watch features three advanced scanning and imaging systems UIG Watch device weighs less than 85 grams only, making it easy to carry and conceal.
eBay
Universal oscilloscope probe 10:1 and 1:1 switchable bandwidth 100 MHz. Easy to install: Compact size, multiple functions combined in one, this probe is convenient to use. The oscilloscope probe is plug and play.
eBay
1 frequency generator for healing. Tap Into The Earth'S Natural Frequency To Improve Your Sleep Quality.
eBay
Steckertyp: Banane, Prüfstift. Farbe: schwarz, rot.
eBay
Sie verfügen im Vergleich zu dieser über eine höhere Energiedichte (ca. das Doppelte) bei gleicher Spannung. Anzahl der Zellen: 7. Unsere Akkus und Batterien erfüllen alle betriebssicherheitsrelevanten VorgabenWas sind die Vorteile der NiMH Technologie?.
eBay
The design is well proven and open-sourced. There are also several open-source PCB designs for the probe and amplifier, but most of them are SMD designs. Carlson Super Probe. (No affiliation with Mr Carlson's Lab).
eBay