Liquid‑in‑Glass Thermometer – -40°C to 40°C Range

The 40-40 liquid‑in‑glass thermometer is a reliable, no‑power‑needed temperature measurement tool for industrial, agricultural, and laboratory applications. With a measurement range from -40°C to +40°C, it covers freezing and moderate ambient temperatures, making it ideal for cold storage monitoring, greenhouse climate control, refrigeration systems, and outdoor weather stations.

The thermometer uses a precise liquid‑filled glass tube with a clear, easy‑to‑read scale. Red or blue liquid contrast sharply against the white background, ensuring quick reading even in low light. The sturdy glass construction and sealed design prevent leakage, while the hanging ring or clip allows for flexible placement on walls, equipment, or racks.

Unlike digital devices, this thermometer requires no batteries or external power – it works reliably in any condition, with no maintenance needed. Its simple mechanical design ensures long‑term stability and accuracy, even in harsh environments.

Perfect for farmers, HVAC technicians, warehouse managers, and home brewers. Trust the classic, dependable liquid‑in‑glass technology.

No power. No fuss. Just accurate temperature.