Abstract: A system for monitoring a liquid level in a reservoir can include another reservoir and a liquid level monitoring apparatus, the apparatus including two float devices, with each of the float devices measuring the liquid level relative to a respective one of the reservoirs. Another liquid level monitoring apparatus can include two laterally spaced apart elongated float guides, two float devices at least partially reciprocably disposed relative to the respective float guides, and an alignment structure that maintains lateral separation and longitudinal alignment of the float guides. A monitoring method can include positioning one reservoir in another reservoir, and partially immersing a liquid level monitoring apparatus in both of the reservoirs, the apparatus including two float devices, each of the float devices thereby measuring a level of the liquid in a respective one of the reservoirs.

Abstract: A system for monitoring a liquid level in a reservoir can include another reservoir and a liquid level monitoring apparatus, the apparatus including two float devices, with each of the float devices measuring the liquid level relative to a respective one of the reservoirs. Another liquid level monitoring apparatus can include two laterally spaced apart elongated float guides, two float devices at least partially reciprocably disposed relative to the respective float guides, and an alignment structure that maintains lateral separation and longitudinal alignment of the float guides. A monitoring method can include positioning one reservoir in another reservoir, and partially immersing a liquid level monitoring apparatus in both of the reservoirs, the apparatus including two float devices, each of the float devices thereby measuring a level of the liquid in a respective one of the reservoirs.