A high tone pitch beep if the level is high. A low tone pitch beep for a low tone. Red LED for High, green LED for low.
Self turn off in a few seconds, Self turn on when any over zero signal is sensed. No power switch. Touching the probe to a live circuit turns it on instead.
Size of a oscifox, one probe tip at each end. One is for logic states, the other for voltage reading.
Li powered; tiny 4.5V solar cell in its back side to recharge it.
Probe tip made of a sewing needle steel, no thick, no brass tip, about 25mm long, jacketed in teflon and protuding only 1 mm out of the jacket.
Replaceable grounding or reference lead and clip that will not come loose during use, made of very flexible cable.
Hope helps --- or likes---
I have the oscifox; do an 'images search'