Hioki DT4200 [DT4223] True-RMS Pocket Digital Multimeter, 600V AC/DC with False Trip Prevention & Resistance. The Hioki DT4200 Digital Multimeter Series consists of a diverse array of meters ranging from professional to industrial to pocket meters, delivering a super fast response rate and safety features that take electrical testing to a higher level. The Hioki DT4223 is a pocket-sized digital multimeter featuring an innovating circuit-breaker false trip prevention function to enhance testing safety and a built-in voltage detector, ideal for electrical inspections.