The Marsden HM-80D is a digital infant length measuring attachment that integrates with the M-400 and M-410 baby scales to provide 1mm-precision length readings displayed on the scale indicator, alongside the weight reading, eliminating the need for a separate manual measuring rod and the transcription step between length measurement and scale reading. With a 10-80cm range covering the full clinical spectrum from premature neonate to toddler, the HM-80D supports the complete growth monitoring data set required by WHO Child Growth Standards and RCPCH centile chart guidance for children under two years.
The digital display removes the parallax reading errors and measurement variability associated with analogue measuring rods and measuring mats, producing a more consistent and reproducible length reading between different clinical operators measuring the same infant.
| Specification | Detail |
|---|---|
| Graduation | 1mm digital |
| Range | 10cm to 80cm |
| Compatible Scales | Marsden M-400 and M-410 |
| Display | Digital, via M-400/M-410 scale indicator |
| Data Transfer | Via scale Bluetooth or Wi-Fi (if fitted) |
| Clinical Use | Supine infant length measurement, WHO growth chart plotting |
The HM-80D's 1mm digital precision meets the measurement accuracy recommended by the RCPCH for infant length recording and WHO growth chart centile plotting. Digital measurement reduces the inter-observer measurement variability that is a documented limitation of analogue measuring rods in community and clinical settings, where different practitioners measuring the same child at the same session may record lengths differing by 3-5mm due to parallax and head positioning differences. Standardised digital measurement supports more reliable centile tracking across different clinicians in NHS health visitor caseloads where infants are weighed by multiple practitioners over the first years of life.
Does the HM-80D work with M-400 scales already in use, or does it require a new scale purchase?
The HM-80D is an accessory that adds to an existing M-400 or M-410 scale. It connects to the scale's indicator directly and displays the length reading on the same screen as the weight. If you already have an M-400 in use, the HM-80D can be added as a separate purchase to enable combined digital weight-and-length measurement without replacing the scale. Confirm compatibility with Marsden's clinical sales team if your M-400 was purchased more than three years ago, as indicator revisions may affect accessory compatibility.
What is the difference between the HM-80D digital height rod and the HM-80P analogue rod?
The HM-80D is a digital measuring rod that connects to the M-400 or M-410 indicator and displays the length reading digitally. The HM-80P is an analogue rod without a digital connection, read manually by the clinician against a millimetre scale. The HM-80D eliminates the manual reading step and the parallax errors associated with analogue measurement, and its digital output can be transferred via Bluetooth if the scale has connectivity. The HM-80P is the lower-cost option where digital display and data transfer are not required, or where the practitioner is using a scale model without the HM-80D connector.
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