Drilling

I agree with your point. if it still works reliably, why replace it completely? What surprised me at university was learning about advanced directional drilling—gyroscopes, MWD, real-time bit tracking—while still using a Marsh Funnel for mud checks. But I think the Marsh Funnel survives for one reason: practicality. It needs no electricity, no calibration, no maintenance. It works in dust, heat, and vibration. You get a reading in seconds, anywhere on the rig, at zero cost. Modern automated rheometers are great for labs and real-time monitoring, but on many rigs—especially remote ones—simple and fast still beats complex and fragile. So yes, it's outdated. But it's not gone because we're nostalgic—it's not gone because in the field, practical often wins over perfect.