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Pen-style non-contact voltage detector that lights and beeps near live AC wiring.

Plug-in GFCI outlet tester with indicator lights for open ground, open neutral, open hot, reversed wiring, and correct wiring, plus a button to trip and verify GFCI outlets.

Two-piece wire continuity tester with a main unit and a separate remote end, used to trace and verify continuity of wire runs.

A 30-count bottle of copper pool & spa test strips plus a small stiff wire brush for maintaining a solar pool ionizer. The strips read copper concentration; the brush scrubs mineral buildup off the ionizer's copper anode.

Aquarium water-test reagent for nitrite (NO2). 1-1/4 fl oz dropper bottle from Mars Fishcare.

Set of four glass test tubes with white plastic caps, used with API freshwater/saltwater test kits.

Aquarium water-test reagent (bottle #1) for phosphate (PO4). 1-1/4 fl oz dropper bottle.

Aquarium water-test reagent for ammonia (NH3/NH4+). 1-1/4 fl oz dropper bottle.

Aquarium water-test reagent for wide-range pH. 1-1/4 fl oz dropper bottle.