The NTM-F housing is an industry standard 2 x 3 x .5" available in plastic only. This is a flat pack Display instrument which requires no panel cutout.This single channel unit is available in loop (4-20mA), A.C. signal or external power to replace fit, form and function any analog or digital panel meter. Our Powerless (loop/signal) versions only consume <60mW, comparable to an analog meter! The external power series features over 30 signal conditioners. The unit is equipped with a 51 segment automatic and programmable tricolor bargraph and four digit LED display (18.104.22.168 and -22.214.171.124). Standard factory set color changes are: red: <10 and >90%, yellow: <20 and >80%, green: >20 and <80% of full scale (you can change it with simple commands). The NTM-F features automatic signal fail detect (open or short) and serial transmission with run time stamp and unit ID. Serial communication via USB included as a standard option. Our patented (and pending) hardware and firmware gives you the highest reliability at the lowest cost. Our flexible firmware allows the NTM-F to operate efficiently with improved response time and offers several math functions such as X-Y tables, polynomials and log-anti-log functions. An additional feature of the external powered NTM-F are our universal power inputs (5-32VDC or 90-265VAC). We have combined over 40 years of experience with the latest ASIC uC and ultra-efficient multicolor LED technology to bring you into the 21st century. Our multi-supplier modular design prevents obsolescence for many years to come. The NTM Series has no moving parts so as to eliminate stuck needles, recalibration and replacement. All OTEK products have a lifetime warranty as a reflection of our quality. The NTM Series includes 20 industry standard models. See if we have a model that fits your needs. If you do not see what you need, tell us your custom needs and we'll make it!