Important Announcements

Date	Model	Caption	Remarks
Sep. 16, 2026	PRECISION BATTERY TESTER BT6065, BT6075	Potential measurement abnormalities under specific settings.	Firmware V1.05 or earlier
Aug. 03, 2026	DIGITAL PHASE DETECTOR PD3259-50, DIGITAL PHASE DETECTOR/WIRELESS ADAPTER PD3259-90	The fluctuation of measurement values becomes bigger, and it may become out of the accuracy or misjudge the phase detection.	Hardware
Mar. 02, 2026	INSULATION TESTER IR4051-10 ,IR4051-11, IR4052-50, IR4052-51, IR4052-91, IR4056-20, IR4056-21, IR4056-36, and IR4057-50	It may be out of the accuracy specifications.	Hardware
Feb. 16, 2026	15MS/S INPUT UNIT U7005	The power phase angle measurement error is occasionally increased when turning on the power, and it may become out of the accuracy specifications at about 20kHz or higher.	Hardware
Dec. 16, 2025	POWER ANALYZER PW8001-01, PW8001-02, PW8001-03, PW8001-04, PW8001-05, PW8001-06, PW8001-11, PW8001-12, PW8001-13, PW8001-14, PW8001-15, PW8001-16	Regarding measurement error when used under specific conditions.	Firmware V2.01–V2.55
Sep. 09, 2025	CLAMP ON EARTH TESTER FT6380, FT6381, FT6380-50, FT6380-90	When measuring the high resistance, the measurement value may fluctuates a lot by open/close action of clamp sensor and may become the out of the accuracy specifications.	Hardware
Sep. 21, 2022	HUMIDITY LOGGER LR5001, LR5001-20	Changes of Calibration Points
Jun. 10, 2022	RESISTANCE METER RM3544-01	Out of accuracy for the first measurement after changing the range in auto range	Applicable firmware versions: Please refer to the link.
May. 29, 2020	CONNECTION CORD L9197	Important Safety Notice and Recall: Connection Cord L9197	Hardware
Jan. 10, 2020	INSULATION TESTER ST5520, ST5520-01	The measurement results may be out of accuracy	Firmware V2.03
Sep. 19, 2019	MEMORY HiCORDER MR6000, MR6000-01	Memory HiCorder does not start at power ON	Firmware V2.00 or earlier
Aug. 01, 2018	Compliance with the EU General Data Protection Regulation
Apr. 02, 2018	Hioki Extends Warranty Period for 400 Products to 3 Years
Aug. 24, 2017	CHEMICAL IMPEDANCE ANALYZER IM3590	Measurement Error Defect	Firmware V1.00–V1.09
Jun. 15, 2015	LEAK CURRENT HiTESTER ST5540, ST5541	ST5540 may generate false pass judgments.	Firmware V1.02–V1.05
Dec. 19, 2014	TACHO HiTESTER FT3405, FT3406	Measured values can become unstable and indicate higher.	Hardware
Jun. 30, 2014	Non-RoHS-Compliant Products
Dec. 19, 2013	DIGITAL MULTIMETER DT4252	Non-conformance with specified current measurement accuracy.	Hardware
Jun. 03, 2013	CLAMP ON POWER LOGGER PW3360-10, PW3360-20, PW3360-30, PW3360-91	Risk of Electric Shock on Models PW3360 series and PW9002	Hardware
Oct. 30, 2012	MEMORY HiCORDER 8841, 8842, 8841T, 8720	If the support feet deteriorate due to exposure to oils or chemicals, the handle may come off.	Hardware
Dec. 16, 2011	DATA LOGGER LR5001, LR5011, LR5021, LR5031, LR5041, LR5042, LR5043, LR5051, LR5061	Erroneous values may appear among the measurement values on a regular basis.	Applicable firmware versions: Please refer to the link.
Jul. 03, 2006	CLAMP ON POWER HiTESTER 3169 Series	There is a risk of short circuits in the product’s input and power supply sections.	Hardware